Hi, We have studied in our schools and universities some of the Physics topics and it's depends of course on the nature rules, but the most incredible thing is to know these nature rules and employing them in somethings that help the whole world.
Here in this experiment the students try to watch the result of the air pressure rules . Erst they heating a 55 gallon steel drum then putting it in the iced water. Its been done before but its always fun to watch.
The most amazing thing in this video that the girl is disturbing because the experiment didn't work at first but after trying to cooling the drum a crash was happened. Go a head and watch this video .
For whom who doesn't know what the pressure means here is a definition: Pressure (the symbol: p) is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure (also spelled gage pressure)[a] is the pressure relative to the local atmospheric or ambient pressure. via Wikipedia