SATURATION occurs when the vapor is at the dewpoint or saturation temperature corresponding to its partial pressure. A gas is never saturated with a vapor. The space occupied jointly by the gas and vapor may be saturated, however. DEGREE OF SATURATION is the ratio of the weight of vapor existing in a given space to the weight that would be present if the space were saturated at the space temperature. SATURATED AIR-VAPOR MIXTURE is one in which the space occupied by the mixture is saturated with water vapor at the mixture temperature. SATURATED VAPOR PRESSURE is the pressure existing at a given temperature in a closed vessel containing a liquid and the vapor from that liquid after equilibrium conditions have been reached. It is dependent only on temperature and must
be determined experimentally. SATURATION PRESSURE is another term for Saturated Vapor Pressure. SATURATION TEMPERATURE is the temperature corresponding to a given saturated vapor pressure for a given vapor. SLIP is the internal leakage within a rotary compressor. It represents gas at least partially compressed but not delivered. It is determined experimentally and expressed in CFM to be deducted from the displacement to obtain
capacity. SLIP RPM is the speed required of a rotary compressor to maintain a given discharge pressure, supplying leakage only (zero actual output). The factor must be established by experiment. SPECIFIC GRAVITY is the ratio of the density of a given gas to the density of dry air, both measured at the same specified conditions of temperature and pressure, usually 14.696 psiA and 60°F. It should also take into account any
compressibility deviations from a perfect gas. SPECIFIC HEAT (Heat Capacity) is the rate of change in enthalpy with temperature. It is commonly measured at constant pressure or at constant volume. The values are different and are known as cp and cv respectively. SPECIFIC HUMIDITY (See Humidity). SPECIFIC VOLUME is the volume of a given weight of gas, usually expressed as cu ft/lb at specific conditions. STANDARD PRESSURE AND TEMPERATURE (SPT) as used on this web site is 14.696 psiA and 60°F unless specifically stated otherwise. STATE of a system (or part thereof) is its condition at an instant of time as described or measured by its properties. SUCTION PRESSURE is absolute static prevailing at the suction of the ejector. SUPER-COMPRESSIBILITY (See Compressibility). TEMPERATURE is the property of a substance that gauges the potential or driving force for the flow of heat. (See also Inlet, Discharge, and Absolute Temperature). THEORETICAL HORSEPOWER (See Horsepower). A THERMAL COMPRESSOR is an ejector used to compress waste or exhaust steam or any other gas through a moderate range of compression above atmospheric pressure. | 
