Скачать или смотреть Create Flames With Adiabatic Compression (The Fire Piston)

Rapid compression of a gas increases its pressure and its temperature at the same time. If this compression is done too slowly the heat will dissipate to the surroundings as the gas returns to thermal equilibrium with them. If the compression is done quickly enough, then there is no time for thermal equilibrium to be achieved. The absolute temperature of the gas can suddenly become much higher than that of its surroundings, increasing from the original room temperature of the gas to a temperature hot enough to set tinder alight. The air in the cylinder acts both as a source of heat and as an oxidizer for the tinder fuel.

You can also buy these neat little fire pistons for use outdoors to start a campfire.

This demo was presented by Geoffrey Franceschi in the ‪@tamu‬ Physics & Astronomy department.

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