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Published on Apr 15, 2009
An inflated balloon can be cooled with liquid nitrogen. A great demonstration of the ideal gas law - as the amount of gas is fixed, as the temperature drops, the volume of the balloon decreases. If you look closely in the second part of the clip you can actually see that the air inside the balloon has been turned into liquid - mostly oxygen (bpt 90K) and some nitrogen (bpt 77K)!