Specific Gas Constant
| Rspecific for dry air |
Units |
|---|---|
| 287.04 | J kg−1 K−1 |
| 53.3533 | ft lbf lb−1 °R−1 |
| 1716.49 | ft lbf slug−1 °R−1 |
The specific gas constant of a gas or a mixture of gases (Rspecific) is given by the molar gas constant, divided by the molar mass (M) of the gas/mixture.
Just as the ideal gas constant can be related to the Boltzmann constant, so can the specific gas constant by dividing the Boltzmann constant by the molecular mass of the gas.
Another important relationship comes from thermodynamics. This relates the specific gas constant to the specific heats for a calorically perfect gas and a thermally perfect gas.
where cp is the specific heat for a constant pressure and cv is the specific heat for a constant volume.
It is common, especially in engineering applications, to represent the specific gas constant by the symbol R. In such cases, the universal gas constant is usually given a different symbol such as R to distinguish it. In any case, the context and/or units of the gas constant should make it clear as to whether the universal or specific gas constant is being referred to.
Read more about this topic: Gas Constant
Famous quotes containing the words specific, gas and/or constant:
“Self-esteem and self-contempt have specific odors; they can be smelled.”
—Eric Hoffer (1902–1983)
“When we can drain the Ocean into mill-ponds, and bottle up the Force of Gravity, to be sold by retail, in gas jars; then may we hope to comprehend the infinitudes of man’s soul under formulas of Profit and Loss; and rule over this too, as over a patent engine, by checks, and valves, and balances.”
—Thomas Carlyle (1795–1881)
“To keep up even a worthwhile tradition means vitiating the idea behind it which must necessarily be in a constant state of evolution: it is mad to try to express new feelings in a “mummified” form.”
—Alfred Jarry (1873–1907)