What happen when release the LPG gas instantly from gas cylinder?

Note: For those, who calling this a waste of resources, this is an experiment done for education, and the height of frost formed outside the tank shows that the tank is near empty. If you consider this a waste, what about tonnes of expensive chemicals thrown away in school labs? Nothing is wasted in both cases, because this educates and inspires people to do even more amazing things. Is it not worth it to spend one quarter cylinder's worth of LPG to help half a million minds understand thermodynamics better? Also, think of it this way: this video probably stopped hundreds of bored and curious minds from opening up a gas cylinder to see what would happen.

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