Squirtle and Snorunt were making ice blocks. Squirtle filled the packet up with water gun and Snorunt froze the water with ice beam. Then, when they were least expecting it, Charmander came running in and knocked the ice block packet over. “Don't worry, I'll clean it up,” said Charmander. Charmander used flamethrower on the ice and it turned from a solid to a liquid to a gas. They asked Charmander to tell them how he had made the ice disappear. “I didn't make it disappear,” said Charmander. “The ice is up there,” he said, pointing to a cloud. Squirtle and Snorunt still didn't get it, so Charmander explained again. “The energy from my flamethrower made the particles in the ice move faster and made it turn into a liquid, water, then it moved even faster and turned into a gas, steam”.
Thursday, July 30, 2009
Monday, July 27, 2009
Air Experiments
Trying to blow a pea into an 'empty' bottle
When you blow air into the bottle, the air already inside the bottle has to go somewhere,
and that somewhere is outside the bottle. When you blow the pea gets pushed out of the bottle by the air leaving.
An 'empty' glass upside down in water does not fill up with water.
It does not get filled with water because it is already filled with air.
A Balloon in a Vacuum Chamber
The air pressure outside the balloon is reduced because the air gets sucked out by the machine.
The balloon gets bigger because the air inside of the balloon expands (gets bigger). The air pressure inside the balloon has remained the same but it is now pushing against a much lower air pressure on the outside.
If there was a huge rubber band in my back yard with 20 kids pushing on the inside and 20 kids pushing on the outside, the band would stay the same size. If ask 10 kids on the outside to go and sit down, then there would be 20 kids pushing out but only 10 kids pushing in. The band would get larger. If 5 more kids on the outside then sit down, the band will get even bigger. So the size of the band depends on the relative 'pressure' inside and outside, just like the balloon in the vacuum chamber.
A Balloon in Floating in Liquid Nitrogen
The air inside the balloon contracts as it cools down, the oxygen and nitrogen in the air become a liquid and take up less space. The balloon shrinks. When the balloon is taken out of the liquid nitrogen it warms up so it expands to it's normal size because the air inside is warming up and expanding.
A Soda can with a little water in it, heated up so that water vapour fills the can, then quickly put upside down in cold water.
As the can goes into the cold water, the water vapour filling the can is suddenly turned back into liquid water which takes up much less space. Now there is about 15 PSI on the outside and almost zero PSI (pressure measurement = pounds per square inch) on the inside, the can is crushed because the air pressure on the outside is pushing in and there is almost no air pressure on the inside to push out.
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