Wednesday, December 16, 2009
Elephant Toothpaste video, will you need hydrogen peroxide 30 volumes and KI solution as a catalyst.
Hydrongen Peroxide and KI solution - Elephant Toothpaste
Elephant Toothpaste video, will you need hydrogen peroxide 30 volumes and KI solution as a catalyst.
Tuesday, December 15, 2009
"This activity models how tensional forces can cause fractures in rocks, sometimes creating rift valleys" From description of youtube
The earth is a dynamic planet, in ours human life time we barely note that, perhaps just when a volcano erupt or a earthquake destroys a city. Analyzing geological features in rocks we found out pieces of a huge puzzle and then theories are created. To confirm those theories some lab experiments were made. This video shows a qualitative experiment that demonstrates how normal faults are formed in a rifting process.
Mirrors always fascinating the human being, the possibility to look ourselves face to face is a mark in a culture of a people. That’s why these objects were so precious in ancient times and still are for some indigenous tribes.
Nowadays it is used, beside the self admiration, in cameras, telescopes and satellites.
When the man first went to the moon, they left a mirror there, so today using a laser is possible to measure the distance earth moon very accurately.
This videos shows how to make a mirror by using the glucose to reduce a silver complex. The metallic silver is deposited in the flask forming a mirror’s surface.
A valley in thirty seconds
"This activity models how tensional forces can cause fractures in rocks, sometimes creating rift valleys" From description of youtube
The earth is a dynamic planet, in ours human life time we barely note that, perhaps just when a volcano erupt or a earthquake destroys a city. Analyzing geological features in rocks we found out pieces of a huge puzzle and then theories are created. To confirm those theories some lab experiments were made. This video shows a qualitative experiment that demonstrates how normal faults are formed in a rifting process.
Chemistry Experiment - How to make a mirror
Mirrors always fascinating the human being, the possibility to look ourselves face to face is a mark in a culture of a people. That’s why these objects were so precious in ancient times and still are for some indigenous tribes.
Nowadays it is used, beside the self admiration, in cameras, telescopes and satellites.
When the man first went to the moon, they left a mirror there, so today using a laser is possible to measure the distance earth moon very accurately.
This videos shows how to make a mirror by using the glucose to reduce a silver complex. The metallic silver is deposited in the flask forming a mirror’s surface.
Saturday, December 12, 2009
The smoke inside the bottle falls becouse it is cold. Otherwise it ascend with the warm air as we always see.
Physics demonstration of Pascal principle using plastic bottles
Falling Smoke
The smoke inside the bottle falls becouse it is cold. Otherwise it ascend with the warm air as we always see.
Pascal Principles and plastic bottles
Physics demonstration of Pascal principle using plastic bottles
Tuesday, December 8, 2009
Monday, August 31, 2009
Make a rainbow over your hands
This book uses the same principle of a flip book to give us the visual sensation of a rainbow.
The way in which a real rainbow is formed is very different. In the sky the colors are formed by the decomposition of white light inside of little particles of water that make the clouds.
Here a strep with some colors of rainbow is placed in each page of the book, when we flip it the rainbow appears. A phenomena called visual persistence allows that, to see more about visual persistence click here.
The way in which a real rainbow is formed is very different. In the sky the colors are formed by the decomposition of white light inside of little particles of water that make the clouds.
Here a strep with some colors of rainbow is placed in each page of the book, when we flip it the rainbow appears. A phenomena called visual persistence allows that, to see more about visual persistence click here.
Tuesday, August 11, 2009
Leidenfrost Effect: putting the finger inside molten lead
This video show the physical principle that allows put the finger inside a molten lead without burn it.
The humidity of ours skin evaporates and the molten lead do not touch the finger.
The same happens with water drops in contact with a very hot frying pan . They don’t evaporate immediately because a vapor layer protects the drop from the heat.
The humidity of ours skin evaporates and the molten lead do not touch the finger.
The same happens with water drops in contact with a very hot frying pan . They don’t evaporate immediately because a vapor layer protects the drop from the heat.
Saturday, August 8, 2009
]
Learn how to do a sodium dichromate volcano
Sodium dichromate is a orange solid. During its decomposition N2 , water and chrome oxide are liberated. The total volume increase in about 30 times. Some chrome oxide dust and the heat liberated make it really seamed with a true volcano.
Thursday, July 23, 2009
Paul hewitt demos, using humor, inertia and physics pulling a tablecloth out from under a table full of plates and glasses and not moving or breaking anything.
The journey for creation of light bulb is shown on this video.
"This is a collection of experiments using a Van de Graaff generator.
The generator uses a belt and two rollers to build up a charge in the dome on top. The electrons will jump from the dome to reach a grounded object. Since like charges repel one another, objects placed on top of the dome will become charged and then be repelled.
This is the same machine sometimes used to make someone's hair stand up in classrooms or in science centers."
From: You tube descripion video
Oil is a very precious natural resource; this video shows how oil is stored in a trap formed by tectonics forces.
Pyrolytcs graphite is a diamagnetic material, which means that a magnetic field will be repelled by this material. Thus the magnet floats
A simple science trick you can do at home, using two rubber bands and a CRT TV screen. The TV screen works as a stroboscopic light, and when the frequency of rubber band is near the TV vertical frequency the rubber band seems to moving in slow motion.
"A single seed crystal was added to the saturated sodium Acetate solution while at 30C. Omnidirectional needle-like crystals radiated outward from the seed on contact at the solution's surface."
From: youtube video description
"This is a demonstration called the rubber band heat engine. As the name suggests, you take rubber bands, apply heat to them and they do work for you... just not terribly much of it. But its interesting nonetheless."
From: youtube video description
Using some sugar, NaOH, and KMnO4 is easy to prepare a rainbow juice. The KMnO4 is reducing and changing the flask color.
This is a very useful invention that can help a lot, this mechanism may save some fingers stopping immediately the saw.
The creator of machine will test the efficiency of his invention, the saw will stop? See for your self
Your Text description. Fill it Or leave it blank.
Interesting phenomena, I didn’t know that rainbow light was polarized
"An early electrostatic influence machine, invented by Wilson in 1804. A ball electroscope observes the output voltage."
From: youtube description video
Science bob explain quickly how to produce sounds from a straw and how to make a chicken voice using a plastic glass.
http://www.youtube.com/watch?v=RwJr6Iugcrkendofvid
[starttext]
This videos shows how polyurethane foam is made, you need just mix together the polyol and the isocyanete. A chemical reaction will happen and the total volume will grow up 30 times the original size.
[endtext]
http://www.youtube.com/watch?v=gjUFTiHYN5kendofvid
[starttext]
Find out how the materials absorb heat and the relation between heat and temperature for different materials.
[endtext]
http://www.youtube.com/watch?v=rOib92FriZYendofvid
[starttext]
Instead of these materials you can use a simple magnet from speakers, paper clips and adhesive type to build your own electrical motor.
[endtext]
http://www.youtube.com/watch?v=zRQkYWpeMsYendofvid
[starttext]
This video shows a different kind of electrical engine, it uses two coils as electrical magnets to attract, alternately, a piece of iron and generates movement.
[endtext]
http://www.youtube.com/watch?v=3jr39mU8H8kendofvid
[starttext]
Water and ice when looked at infra red camera can help us to understand how light and heat are related.
[endtext]
http://www.youtube.com/watch?v=Lcf9wyW_3GEendofvid
[starttext]
Infra red light can be thought of as “heat”
The warmer something is, the more brightly it glows in the infrared.
Apiece of glass may be bright, but it is cool, so it will appear black in the infra red camera.
Even though a person may stand in shadows her body heat shines in the infrared.
[endtext]
What causes an eclipse of the moon?
An eclipse is nothing more than a shadow, actually a huge shadow. Don’t believe on me? What this video and learn more about eclipses and our natural satellite, the moon.
[endtext]
Have you asked for yoursel why doesn't moon falls on earth? Watch this video and find out that actually it is falling, all the time.
http://www.youtube.com/watch?v=BvjeP3SfD1gendofvid
[starttext]
Have you ever thought why there aren’t green stars?
Looking to the sky at night we can identify some red stars, yellow stars and blue stars indeed, we’ll never see a green star.
Watch this video and find out the answer.
[endtext]
What a star really is? How matter ( gas and dust) collapse by the gravity force?
What is the end of a star?
You can find the answers for these questions and much more information about the stars evolutions on this video.
Play baseball with molecules and learn what makes the sky blue or sometimes red!
This video shows the effects of solar winds on earth, the hazards, boreal aurora and the earth's magnetic field protection against solar particles
Marshmallows contains air inside, the vacuum will reduce the inner pressure and make the air inside the marshmallows expand, thus the marshmallows grow up.
When we put a penny in a flask containing nitric acid a chemical reaction happens, liberating nitrogen dioxide as a gas.
"Warning: Do not attempt this reaction. The gases produced are dangerous and must be properly controlled and ventilated. Also, the concentrated nitric acid used can cause severe acid burns.
If you've been keeping up, you know that we already popped a small balloon, but our intention all along was to go big. After purchasing larger balloons, we did a test run... and it was still essentially a flop. In this experiment, we use a snazzy apparatus with dual layered balloons to combat the corrosive nature of the Nitrogen Dioxide gas (and it really is corrosive).
The liquid in the first flask is concentrated Nitric Acid. When we placed a number of pennies in the flask, the acid reacted with the copper and released the nitrogen dioxide. The blue color in the copper solution is due to the copper ions.
You will notice a sort of double pop, and that is due to our double balloon layer. Contrary to popular belief, it is not magic.
If you're observant, you will also notice just how corroded the popped balloons did get. And, if you can take your eyes away from the balloons and smoke, check out the blue acid solution boiling in the foreground.
The overall after hours reaction should be considered a success, and hopefully you will find our diligent and persistent work to be enjoyable :)"
From: GWNProductions youtube channel
Click here to see how a piece of glass can become a electrical conductor.
"A small glass tube, held by copper wire, is placed in series with a light bulb. The glass acts as an insulator at room temperature, meaning the current cannot flow between the copper wires. This leaves an open circuit and the light bulb does not light up. Touching a conductor across the copper wires (with a metal screwdriver for instance) does complete the circuit because it allows current to flow.
However, when glass is sufficiently heated by a torch it becomes an ionic conductor. Ionic bonds in the glass are broken, allowing the charge carrying ions to move freely. Thus, when the glass is melted the current can flow, which closes the circuit and lights the bulb.
See the original video on MIT TechTV - http://techtv.mit.edu/file/1104/"
From: MIT youtube channel
The old tablecloth trick by Paul Hewitt
Paul hewitt demos, using humor, inertia and physics pulling a tablecloth out from under a table full of plates and glasses and not moving or breaking anything.
The light bulb history may inspire you
The journey for creation of light bulb is shown on this video.
Collection of experiments using a Van de Graaff generator
"This is a collection of experiments using a Van de Graaff generator.
The generator uses a belt and two rollers to build up a charge in the dome on top. The electrons will jump from the dome to reach a grounded object. Since like charges repel one another, objects placed on top of the dome will become charged and then be repelled.
This is the same machine sometimes used to make someone's hair stand up in classrooms or in science centers."
From: You tube descripion video
Geology formation of a basin trap oil
Oil is a very precious natural resource; this video shows how oil is stored in a trap formed by tectonics forces.
Magnet levitates in a plate of pyrolytcs graphite
Pyrolytcs graphite is a diamagnetic material, which means that a magnetic field will be repelled by this material. Thus the magnet floats
Slow-motion Rubber Band Trick: that is Amazing!
A simple science trick you can do at home, using two rubber bands and a CRT TV screen. The TV screen works as a stroboscopic light, and when the frequency of rubber band is near the TV vertical frequency the rubber band seems to moving in slow motion.
Sodium Acetate Slow Crystalization
"A single seed crystal was added to the saturated sodium Acetate solution while at 30C. Omnidirectional needle-like crystals radiated outward from the seed on contact at the solution's surface."
From: youtube video description
Thermal rubber band machine
"This is a demonstration called the rubber band heat engine. As the name suggests, you take rubber bands, apply heat to them and they do work for you... just not terribly much of it. But its interesting nonetheless."
From: youtube video description
Rainbow Juice using Sugar, KMnO4 and NaOH
Using some sugar, NaOH, and KMnO4 is easy to prepare a rainbow juice. The KMnO4 is reducing and changing the flask color.
An invention that can save a life, or some fingers
This is a very useful invention that can help a lot, this mechanism may save some fingers stopping immediately the saw.
The creator of machine will test the efficiency of his invention, the saw will stop? See for your self
The effect of a polarizer on a rainbow light
Your Text description. Fill it Or leave it blank.
Interesting phenomena, I didn’t know that rainbow light was polarized
Make at home one Wilson's machine
"An early electrostatic influence machine, invented by Wilson in 1804. A ball electroscope observes the output voltage."
From: youtube description video
Music from a straw and a chicken in a cup
Science bob explain quickly how to produce sounds from a straw and how to make a chicken voice using a plastic glass.
The magic of polyurethane foam: polyol and isocyante
[starttext]
This videos shows how polyurethane foam is made, you need just mix together the polyol and the isocyanete. A chemical reaction will happen and the total volume will grow up 30 times the original size.
[endtext]
Is possible to boil water inside a balloon?
[starttext]
Find out how the materials absorb heat and the relation between heat and temperature for different materials.
[endtext]
Simple way to build an electrical motor
[starttext]
Instead of these materials you can use a simple magnet from speakers, paper clips and adhesive type to build your own electrical motor.
[endtext]
Different kind of electrical engine
[starttext]
This video shows a different kind of electrical engine, it uses two coils as electrical magnets to attract, alternately, a piece of iron and generates movement.
[endtext]
Infra red images of everyday life 2
[starttext]
Water and ice when looked at infra red camera can help us to understand how light and heat are related.
[endtext]
Infra red images of everyday life
[starttext]
Infra red light can be thought of as “heat”
The warmer something is, the more brightly it glows in the infrared.
Apiece of glass may be bright, but it is cool, so it will appear black in the infra red camera.
Even though a person may stand in shadows her body heat shines in the infrared.
[endtext]
The huge shadow called eclipse
An eclipse is nothing more than a shadow, actually a huge shadow. Don’t believe on me? What this video and learn more about eclipses and our natural satellite, the moon.
[endtext]
Why doesn't the moon falls down on earth? Actually it falls!
Have you ever thought why there aren’t green stars?
[starttext]
Have you ever thought why there aren’t green stars?
Looking to the sky at night we can identify some red stars, yellow stars and blue stars indeed, we’ll never see a green star.
Watch this video and find out the answer.
[endtext]
Stellar evolution video: how stars live and die
What a star really is? How matter ( gas and dust) collapse by the gravity force?
What is the end of a star?
You can find the answers for these questions and much more information about the stars evolutions on this video.
What makes the sky blue?
Play baseball with molecules and learn what makes the sky blue or sometimes red!
The effects of solar winds
This video shows the effects of solar winds on earth, the hazards, boreal aurora and the earth's magnetic field protection against solar particles
Marshmallows in a vacuum chamber
Marshmallows contains air inside, the vacuum will reduce the inner pressure and make the air inside the marshmallows expand, thus the marshmallows grow up.
Nitric Acid and a Penny
When we put a penny in a flask containing nitric acid a chemical reaction happens, liberating nitrogen dioxide as a gas.
"Warning: Do not attempt this reaction. The gases produced are dangerous and must be properly controlled and ventilated. Also, the concentrated nitric acid used can cause severe acid burns.
If you've been keeping up, you know that we already popped a small balloon, but our intention all along was to go big. After purchasing larger balloons, we did a test run... and it was still essentially a flop. In this experiment, we use a snazzy apparatus with dual layered balloons to combat the corrosive nature of the Nitrogen Dioxide gas (and it really is corrosive).
The liquid in the first flask is concentrated Nitric Acid. When we placed a number of pennies in the flask, the acid reacted with the copper and released the nitrogen dioxide. The blue color in the copper solution is due to the copper ions.
You will notice a sort of double pop, and that is due to our double balloon layer. Contrary to popular belief, it is not magic.
If you're observant, you will also notice just how corroded the popped balloons did get. And, if you can take your eyes away from the balloons and smoke, check out the blue acid solution boiling in the foreground.
The overall after hours reaction should be considered a success, and hopefully you will find our diligent and persistent work to be enjoyable :)"
From: GWNProductions youtube channel
conducting glass
"A small glass tube, held by copper wire, is placed in series with a light bulb. The glass acts as an insulator at room temperature, meaning the current cannot flow between the copper wires. This leaves an open circuit and the light bulb does not light up. Touching a conductor across the copper wires (with a metal screwdriver for instance) does complete the circuit because it allows current to flow.
However, when glass is sufficiently heated by a torch it becomes an ionic conductor. Ionic bonds in the glass are broken, allowing the charge carrying ions to move freely. Thus, when the glass is melted the current can flow, which closes the circuit and lights the bulb.
See the original video on MIT TechTV - http://techtv.mit.edu/file/1104/"
From: MIT youtube channel
Wednesday, July 22, 2009
Learn more about Infra Red Vision and how does it influence our life.
Dr. Michelle Thaller explains infrared light
Learn more about Infra Red Vision and how does it influence our life.
Tuesday, July 21, 2009
Egg in a Bottle Science Trick
Follow the instructions and learn the classic and fantastic science trick: “Egg in a Bottle"
The hot air inside the bottle cools down reducing the inner pressure, thus the atmospheric pressure will push the egg.
The hot air inside the bottle cools down reducing the inner pressure, thus the atmospheric pressure will push the egg.
Saturday, July 18, 2009
Paul Hewitt shows how to produce colored shadows
In this video we can see the three primary colors come together and forming white light. Paul Hewitt also shows how to produce colored shadows, that is incredible and fun! Try yourself in home; you’ll need just three lights: red, green and blue.
The TV screens uses the same principle, with this three colors mixed together is possible make any other color, will depends just of intensity of each one.
The TV screens uses the same principle, with this three colors mixed together is possible make any other color, will depends just of intensity of each one.
Sunday, July 12, 2009
As you can see in the video above, the answer is a lot! The is possible thanks a property called surface tension. The liquid’s surface molecules attract each other forming drops or the spherical layer over the glass formed by the volume occupied by pins.
This property of liquids allows small insects literally walk over the water without sink!
See more on Wikipedia
Homemade lava lamp using simple materials
Using simple materials is possible make a lava lamp as shown above.
The water is more dense than the vegetable oil, so it sink. When the seltzer tablet is added the gás liberated makes the water float.
The water is more dense than the vegetable oil, so it sink. When the seltzer tablet is added the gás liberated makes the water float.
Running Pepper: a miracle of surface tension
Here we have another example of science experiments that uses surface tension to works.
Spread peppers in a plate full of water as the video above shows, then put a drop of liquid soap on your finger and put the finger in the middle of the plate to make the peppers run away.
In the post "How many pins is possible to put in a glass full of water" we explain what is surface tension, the soap will reduce the surface tension (the attractive force between the molecules of surface) and the water will run and carry the peppers with it.
Spread peppers in a plate full of water as the video above shows, then put a drop of liquid soap on your finger and put the finger in the middle of the plate to make the peppers run away.
In the post "How many pins is possible to put in a glass full of water" we explain what is surface tension, the soap will reduce the surface tension (the attractive force between the molecules of surface) and the water will run and carry the peppers with it.
Science Experiments: Magic soap bubbles
Baking soda and vinegar are very useful in science experiments, here we have another example in which this materials are used to amaze the people!
Put some vinegar in a aquarium, latter put some baking soda. The result of reaction is sodium acetate and carbon dioxide.
The CO2 is more dense than the air, so a soap bubble will float on it as a boat float on water. The buoyancy force is equal the weight of the bubble, thus we have the equilibrium and the bubble remains on interface CO2 / Air
Put some vinegar in a aquarium, latter put some baking soda. The result of reaction is sodium acetate and carbon dioxide.
The CO2 is more dense than the air, so a soap bubble will float on it as a boat float on water. The buoyancy force is equal the weight of the bubble, thus we have the equilibrium and the bubble remains on interface CO2 / Air
How many pins is possible to put in a glass completely full of water?
As you can see in the video above, the answer is a lot! The is possible thanks a property called surface tension. The liquid’s surface molecules attract each other forming drops or the spherical layer over the glass formed by the volume occupied by pins.
This property of liquids allows small insects literally walk over the water without sink!
See more on Wikipedia
Slow motion rubber band trick
Put a rubber band in front of a TV screen to see it vibrating in a slow motion. Actually the vibration remain the same but we have the sensation that it slow down. This phenomenon is possible just because the frequency of rubber band's vibration is near the vertical frequency of screen.
The TV screen works as a stroboscopic light and it will not works in front of LCD screen.
The TV screen works as a stroboscopic light and it will not works in front of LCD screen.
Amazing science experiment: “nothing” put the candles out
What this video shows seems a magic trick but is pure science!
Baking soda (sodium bicarbonate) when is mixed up with vinegar (acetic acid) produces a gas called carbon dioxide. This gas fill the space around the candle flame and put it out because there is no oxygen, essential to combustion.
Some fire extinguishers use this kind of gas.
Baking soda (sodium bicarbonate) when is mixed up with vinegar (acetic acid) produces a gas called carbon dioxide. This gas fill the space around the candle flame and put it out because there is no oxygen, essential to combustion.
Some fire extinguishers use this kind of gas.
Build a little hot air balloon: the tea bag experiment
Using a simple tea bag is possible make a little hot air balloon, see the video instructions.
The fire heat the air inside the balloon, hot air is less dense than cold air, result: a buoyancy force greater than the weight will make the balloon fly.
The fire heat the air inside the balloon, hot air is less dense than cold air, result: a buoyancy force greater than the weight will make the balloon fly.
Reaction between sugar and concentrated sulfuric acid produces coal
The concentrated sulfuric acid can take the water out of the sugar molecule producing coal plus water according to reaction equation:
C12H22O11(s) → 12 C(s) + 11 H2O(aq)
That is a exothermic process and liberates poison's vapors, then take care and use one appropriated place , don’t do it indoors!
C12H22O11(s) → 12 C(s) + 11 H2O(aq)
That is a exothermic process and liberates poison's vapors, then take care and use one appropriated place , don’t do it indoors!
Subscribe to:
Posts (Atom)