The adiabatic index of a gas, is the ratio of its Specific_heat_capacity at constant pressure (CP) to its specific heat capacity at constant volume (CV). It is denoted by the Greek_alphabet γ (Gamma) or the greek letter κ (Kappa (letter)). :γ = CP / CV To understand this definition consider the following experiment: A closed cylinder with a locked piston is filled with air. This cylinder is heated. Since the piston cannot move the volume is constant. Temperature and pressure rise. Heating is stopped and the energy added to the system, which is proportional to CV, is noted. The piston is now freed and moves outwards, expanding without absorbing energy (Adiabatic_process). Doing this Mechanical_work (proportional to CP) cools the air to below its starting temperature. To return to the starting temperature the air must be heated. This extra heat amounts to about 40% of the previous amount. Thus Air has an adiabatic index of approximately 1.4; a result often used in aerodynamics. Thermodynamics
* I moved this article from :Category:Physics to :Category:Thermodynamics. Physics is overcrowded, and this seemed to be any easy recategorization. User:StuTheSheep 20:44, Mar 17, 2005 (UTC)
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Adiabatic index
The adiabatic index of a gas, is the ratio of its Specific_heat_capacity at constant pressure (CP) to its specific heat capacity at constant volume (CV). It is denoted by the Greek_alphabet γ (Gamma) or the greek letter κ (Kappa (letter)). :γ = CP / CV To understand this definition consider the following experiment: A closed cylinder with a locked piston is filled with air. This cylinder is heated. Since the piston cannot move the volume is constant. Temperature and pressure rise. Heating is stopped and the energy added to the system, which is proportional to CV, is noted. The piston is now freed and moves outwards, expanding without absorbing energy (Adiabatic_process). Doing this Mechanical_work (proportional to CP) cools the air to below its starting temperature. To return to the starting temperature the air must be heated. This extra heat amounts to about 40% of the previous amount. Thus Air has an adiabatic index of approximately 1.4; a result often used in aerodynamics. Thermodynamics
Adiabatic index
* I moved this article from :Category:Physics to :Category:Thermodynamics. Physics is overcrowded, and this seemed to be any easy recategorization. User:StuTheSheep 20:44, Mar 17, 2005 (UTC)
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