adiabatic defined in 1939 year

adiabatic - Adiabatic (Gr. adiabatos, not passed through);
adiabatic - Term used to denote the state of a gas or any other body, when no heat enters or leaves it. When a gas is compressed it becomes heated, but when pressure is taken off the gas cools. The adiabatic expansion of a gas in a closed space, therefore, implies a fall of its temperature, and this principle is made use of in obtaining very low temperatures. That is to say, when a gas has been cooled to the point at which it liquefies, a still lower temperature can be reached by taking pressure from the gas. The gas then adiabatically expands and its temperature is lowered in the process. The principle is employed in gas turbine engines.

near adiabatic in Knolik

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