COMPRESSION PROCESSESThermodynamicsIdealGas LawBy combining the results of Charles' and Boyle's experiments, the relationship(1-42)PvTconstantmay be obtained. The constant in the above equation is called the ideal gas constant and isdesignated by R; thus the ideal gas equation becomesPv = RT(1-43)where the pressure and temperature are absolute values. The values of the ideal gas constant(R) for several of the more common gases are given in Figure 39.Figure 39 Ideal Gas Constant ValuesThe individual gas constant (R) may be obtained by dividing the universal gas constant (Ro) bythe molecular weight (MW) of the gas, . The units of R must always be consistentR RoMWwith the units of pressure, temperature, and volume used in the gas equation. No real gasesfollow the ideal gas law or equation completely. At temperatures near a gases boiling point,increases in pressure will cause condensation to take place and drastic decreases in volume. Atvery high pressures, the intermolecular forces of a gas are significant. However, most gases arein approximate agreement at pressures and temperatures above their boiling point.HT-01Page 98Rev. 0
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