Wednesday, September 15, 2010
These two questions are hard to answer because the lightning happens so fast that we see just a blinding light coming from the sky followed by a deafening thunder.
What, in ancient times, was considered divine powers, today is explained and detailed observed with help of science.
This video shows a slow motion lighting behavior.
We can see the three kinds of lightning: cloud to the ground, ground to the cloud and cloud to cloud.
Is also possible to see how the discharge follows the ionized air of the previous discharge.
Slow Motion ligthning
How does a lightning form? And how does it behave?
These two questions are hard to answer because the lightning happens so fast that we see just a blinding light coming from the sky followed by a deafening thunder.
What, in ancient times, was considered divine powers, today is explained and detailed observed with help of science.
This video shows a slow motion lighting behavior.
We can see the three kinds of lightning: cloud to the ground, ground to the cloud and cloud to cloud.
Is also possible to see how the discharge follows the ionized air of the previous discharge.
Friday, August 13, 2010
When two materials are rubbed a kind of effect appears, they become charged. The polarity (what material will become positive and what will become negative) is given by the triboelectric series.
Usually, physics teachers use a pipe and a cat or rabbit hide to demonstrate this effect. This video shows how a children playing on a plastic slide can generate static electricity.
Both, children and slide become charged and that can be noted because the children’s hairs stand on end.
Triboelectricity - Children playing on a Plastic slide
Usually, physics teachers use a pipe and a cat or rabbit hide to demonstrate this effect. This video shows how a children playing on a plastic slide can generate static electricity.
Both, children and slide become charged and that can be noted because the children’s hairs stand on end.
Friday, March 12, 2010
This video shows simple science tricks that can be used to amuse friends in a party, play with children or even in a science fair.
I wish you enjoy it.
The best science tricks for parties, at least a geek party!
Thursday, February 18, 2010
Square bubbles sounds impossible, ours brains connect the word bubble with the spherical shape. However this video shows how to produce square bubbles using a science trick.
Steve Spangler teaches how to make square bubbles
Tuesday, February 2, 2010
Flutter Effect is a self-feeding mechanism in which aerodynamic forces on a object (This case an airplane wing) are coupled with the natural mode of vibration of this object to produce a periodic and, sometimes, destructive motion.
Flutter Effect - Dynamic Aeroelasticity
Flutter Effect is a self-feeding mechanism in which aerodynamic forces on a object (This case an airplane wing) are coupled with the natural mode of vibration of this object to produce a periodic and, sometimes, destructive motion.
Thursday, January 28, 2010
This video shows a pumpkins cannon. It uses compressed air to accelerates the pumpkins through out a long pipe. As bigger the pipe, more time the pumpkin is accelerated, so higher is the inicial velocity. At a 45 degress angle the pumpkin reach the maximum horizontal distance.
Lets pump...pumpkins
This video shows a pumpkins cannon. It uses compressed air to accelerates the pumpkins through out a long pipe. As bigger the pipe, more time the pumpkin is accelerated, so higher is the inicial velocity. At a 45 degress angle the pumpkin reach the maximum horizontal distance.
Wednesday, January 27, 2010
Nitrocellulose, an explosive similar to nitroglicerin but, instead of glicerin, it has cellulosis on its composition. It is not sensitive to impact just to heat.
It burns so fast that there is no time to exchange heat with the hand
This tick uses the pascal principle to break up the bottom of a bottle! You'll need some practice to do that. Warning, the broken glass can be very dangerous!
This video shows how to make ferrofluid using household materials
Nitrocellulose - the gun cotton
Nitrocellulose, an explosive similar to nitroglicerin but, instead of glicerin, it has cellulosis on its composition. It is not sensitive to impact just to heat.
It burns so fast that there is no time to exchange heat with the hand
Pascal Principle bracks the bottle
This tick uses the pascal principle to break up the bottom of a bottle! You'll need some practice to do that. Warning, the broken glass can be very dangerous!
Make ferrofluid using household materials
This video shows how to make ferrofluid using household materials
Tuesday, January 26, 2010
This video shows how to play tennis using a soap bubbles and a carpet racket. The soap bubbles are formed by a doubled layer of soap at extremities and a layer of water at center.
The polar part of soap molecules are bonded to the water and the nonpolar part are on the outer side.
Carpet is composed of polyester, as the bubble's outer side, so the interaction between them is very weak and the bubble do not pop out.
How to Play tennis using soap bubbles and a carpet racket
This video shows how to play tennis using a soap bubbles and a carpet racket. The soap bubbles are formed by a doubled layer of soap at extremities and a layer of water at center.
The polar part of soap molecules are bonded to the water and the nonpolar part are on the outer side.
Carpet is composed of polyester, as the bubble's outer side, so the interaction between them is very weak and the bubble do not pop out.
Monday, January 25, 2010
Each chemical element has its own Identity given by the color emited when it is burning. The colors in fireworks is due a diferent kind of elements. Copper give the color green, sodium give the yellow one. This video shows a lot of diferent elements and its correspondent colors.
Glycerine or glicerol is oxidized by a very powerfull oxidant, the potassium permanganete. This reaction liberates a lot of heat, it's called exothermic reaction.
Learn about science and you make your own butter. Science has never tasted so good.
"Innovative technology often can make yesterday's science fiction into today's reality. This is particularly true with a prosthetic hand that brings to life fictional accounts of artificial, computer-driven replacement body parts. The bionic hand, called the I-Limb,was named one of the top 50 inventions this year by Time Magazine." From youtube description
Robots at third Austrian Hexapod Championships: Category Dance. The best of 2009!
Flame test as you never seen before
Each chemical element has its own Identity given by the color emited when it is burning. The colors in fireworks is due a diferent kind of elements. Copper give the color green, sodium give the yellow one. This video shows a lot of diferent elements and its correspondent colors.
Oxydation of glycerine by potassium permanganate
Glycerine or glicerol is oxidized by a very powerfull oxidant, the potassium permanganete. This reaction liberates a lot of heat, it's called exothermic reaction.
Science experiment - how to make butter
Learn about science and you make your own butter. Science has never tasted so good.
Bionic Hand is a Reality
"Innovative technology often can make yesterday's science fiction into today's reality. This is particularly true with a prosthetic hand that brings to life fictional accounts of artificial, computer-driven replacement body parts. The bionic hand, called the I-Limb,was named one of the top 50 inventions this year by Time Magazine." From youtube description
Best of Dance 2009 - Austrian Hexapod Championships
Robots at third Austrian Hexapod Championships: Category Dance. The best of 2009!
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