| Revision as of 00:43, 19 September 2004 editKappa (talk | contribs)36,858 edits dab kappa← Previous edit | Latest revision as of 05:55, 2 March 2007 edit undoMythealias (talk | contribs)Extended confirmed users958 editsm fixed redirect link | ||
| (28 intermediate revisions by 21 users not shown) | |||
| Line 1: | Line 1: | ||
| #REDIRECT ] | |||
| The '''adiabatic index''' of a ], usually denoted by the symbol κ (]) (also called γ), is the ratio of its specific heat at constant ] (c<sub>p</sub>) to its specific ] at constant ] (c<sub>V</sub>). | |||
| :κ = c<sub>p</sub>/c<sub>V</sub> | |||
| One can easily understand the relation if one thinks of the following experiment: A cylinder closed at one end with a blocked piston is filled with air. This cylinder is then heated. Since the piston cannot move the volume is constant. Temperature and pressure will rise. One stops the heating noting how much energy one has added to the system (c<sub>v</sub>) and frees the piston. The piston will move outward and by adiabatic expansion the gas cools. To bring the temperature of the gas to its former level one has to heat it a little bit. This extra heat amounts to about 40% of c<sub>v</sub> thus: | |||
| :c<sub>p</sub> = 1.402 · c<sub>V</sub> | |||
| A value often used in ]s is | |||
| :c<sub>p</sub> - c<sub>V</sub> = 0.4 | |||
| Kappa can also refer to several other things, but it can usually be determined by the context which one. Sometimes the greek letter gamma γ is used. | |||
| ] | |||
| ] | |||
Latest revision as of 05:55, 2 March 2007
Redirect to: