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Discussion Boards => Off-Topic => Topic started by: rricardi58 on May 11, 2013, 10:54:14 pm
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What follows maybe classed as an unusual post. The following is an example of the law of thermodynamics.
Here is what you do. Take a plastic bottle, preferably one that you may originally contained water, coke, flavored water. This will also work with a coke can, or any time of similar can.
Add really hot water to the empty can (BTW: the bottle or can must be empty to start). You can also boil water and use that as well.
Next add the hot or boiling water to the can or bottle. Put the plastic cap back on the bottle - for a can, you could stuff a crumbled napkin in the opening as long as the opening is plugged.
Next shake the bottle or can - I am not sure if this matters, but I think it improves the result. Next remove the plug and empty the contents of the hot or boiling water.
Wait about 20 or 30 second to allow some air to escape along with water vapors.
Then replug the bottle or can tightly.
If you have done it correctly, within 30 seconds you will see the bottle or can flatten to some degree in the middle - as if you tried to crush the bottle or can with your hand.
I have repeated this on empty Propel bottles. But it should work with empty water bottles as well.
Alternatively you can gently shake the bottle or can with it still open before you plug it or cap it - you don't want to shake to violently so as to shake hot water on yourself or hand.
If you understand the laws of temperature and pressure, you should understand why this happens.
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That's the same reason why for those of us in the north see that happen to water bottles left in your car overnight in the winter - mostly if you've opened the bottle to drink while driving (assuming you brought the bottle from indoors). By morning, the bottle is partially "crushed" when the temperatures nose dived during the night.
It's also related to why your bottles get "crushed" when you take them on a plane and drink from them in flight too.
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I never really thought of fun/cool science experiement (other then fire ice) until my Physics 2 professor decides to share them to the class.... Some being making plasma from a microwave using matches and a bowl, big water bubbles using blue dawn dishwasher, microwaving a cd, etc....
I have found a youtube channel that has videos of cool/fun science experiments... Go check out HouseholdHackers
Edit: I seen people use calcium carbide to lit ice on fire, but you can coat the ice with rubbing alcohol or ethanol to be able to set the ice on fire