Specific gas constant

If the value mw R is the same for all gases, the universal gas constant Ugc is defined and R becomes the specific gas constant. 

Step 5. Calculate the compressor inlet volume using Equation 2.10 First use Equation 2.5 to calculate the specific gas constant. 

Specific heat Cp can be calculated using specific gas constant R and specific heat ratio k. 

D - shaft diameter, in h - radial clearance, in Pq = high side pressure, psia T(, = temperature, °R R -- specific gas constant n = number of rings in series a = parameter, function of p po (see Figure D-7)... 

In this very useful form, Rg is known as the universal gas constant, has a value of 1545 and is the same for all gases. The specific gas constant (i i) for any gas can be obtained by dividing 1545 by the molecular weight. Rg is only equal to 1545 when gas pressure (p) is in PSIA volume (y) is expressed as cubic feet per pound mole and temperature (T) is in Rankine or absolute, i.e. °F + 460. 

The conditions that apply for the saturated liquid-vapor states can be illustrated with a typical p-v, or (1 /p), diagram for the liquid-vapor phase of a pure substance, as shown in Figure 6.5. The saturated liquid states and vapor states are given by the locus of the f and g curves respectively, with the critical point at the peak. A line of constant temperature T is sketched, and shows that the saturation temperature is a function of pressure only, Tsm (p) or psat(T). In the vapor regime, at near normal atmospheric pressures the perfect gas laws can be used as an acceptable approximation, pv = (R/M)T, where R/M is the specific gas constant for the gas of molecular weight M. Furthermore, for a mixture of perfect gases in equilibrium with the liquid fuel, the following holds for the partial pressure of the fuel vapor in the mixture ... 

The product of the specific gas constant and molar mass is therefore the same for all gases and it is termed the universal gas constant. 

Here t Is the time and R the specific gas constant of the vapor. For r > X macroscopic thermodynamic processes of heat removal by conduction limit the growth rate... 

R denotes the specific gas-constant, Cp and c the specific heat at constant pressure and constant volume, respectively, and c the specific heat of the liquid phase. Further, gas, vapour and liquid are indicated by subscripts g, v and I, respectively. The latent heat L varies with temperature according to ... 

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