SCI-M 216 THERMODYNAMICS LECTURE Chapter Notes -Gas Constant, Heat Capacity Ratio, Perfect Gas
11 Feb 2023
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Ideal gas: is a hypothetical gas that obeys the gas laws perfectly at all temperatures and pressures. (hypothetical means theoretical, imaginary or assumed), is ideal only in the sense that it conforms to the simple perfect gas laws. V = volume n = number of moles. T = absolute temperature: mass, density, specific volume m. Pm m n = m/m rho = m/v. R = pv/nt = 0. 08206 l-atm/mol-k = 8. 314 kj/mol-k. Relation among cp, cv and r: c p c r v, k c c p v k 1. 4 for cold air k 1. 3 for hot air, c p, c v k 1. R k 1 where: cp = specific heat at constant pressure cv = specific heat at constant volume. R = universal gas constant k = specific heat ratio = (gamma) R = 0. 287 kj/kg-k = 53. 35 ftlbf/lbm r cp = 1 kj/kg-k = 0. 24 btu/lbm r cv = 0. 716 kj/kg-k = 0. 171 btu/lbm r.
