Gas Constant - Specific Gas Constant

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:

    I was asking for something specific and perfect for my city,
    Whereupon lo! upsprang the aboriginal name.
    Now I see what there is in a name, a word, liquid, sane, unruly,
    musical, self-sufficient,
    I see that the word of my city is that word from of old,
    Because I see that word nested in nests of water-bays, superb,
    Rich, hemm’d thick all around with sailships and steamships, an
    island sixteen miles long, solid-founded,
    Walt Whitman (1819–1892)

    A new father quickly learns that his child invariably comes to the bathroom at precisely the times when he’s in there, as if he needed company. The only way for this father to be certain of bathroom privacy is to shave at the gas station.
    Bill Cosby (20th century)

    With wavering steps does fickle fortune stray,
    Nowhere she finds a firm and fixed abode;
    But now all smiles, and now again all frowns,
    She’s constant only in inconstancy.
    Ovid (Publius Ovidius Naso)