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The commonly known phases solid, liquid and vapor are separated by phase boundaries, i.e. pressure–temperature combinations where two phases can coexist. At the triple point, all three phases can coexist. However, the liquid–vapor boundary terminates in an endpoint at some critical temperature T c and critical pressure p c. This is the ...
Critical point: 369.522 K (96.672 °C), 42.4924 bar ... Liquid properties Std enthalpy change of formation, ... Propane is highly temperature dependent. [3]
The heat of vaporization diminishes with increasing temperature and it vanishes completely at a certain point called the critical temperature (T r = 1). Above the critical temperature, the liquid and vapor phases are indistinguishable, and the substance is called a supercritical fluid.
As the critical temperature is approached (300 K), the density of the gas at equilibrium becomes higher, and that of the liquid lower. At the critical point, (304.1 K and 7.38 MPa (73.8 bar)), there is no difference in density, and the 2 phases become one fluid phase. Thus, above the critical temperature a gas cannot be liquefied by pressure.
A saturation dome uses the projection of a P–v–T diagram (pressure, specific volume, and temperature) onto the P–v plane. The points that create the left-hand side of the dome represent the saturated liquid states, while the points on the right-hand side represent the saturated vapor states (commonly referred to as the “dry” region).
The equilibrium conditions are shown as curves on a curved surface in 3D with areas for solid, liquid, and vapor phases and areas where solid and liquid, solid and vapor, or liquid and vapor coexist in equilibrium. A line on the surface called a triple line is where solid, liquid and vapor can all coexist in equilibrium. The critical point ...
Thus, liquid propane has a density of approximately 4.2 pounds per gallon (504 g/L) at 60 °F (15.6 °C). [30] As the density of propane changes with temperature, this fact must be considered every time when the application is connected with safety or custody transfer operations. [31] Temperature–density curve for liquid/vapor propane
It is useful to note that for N 2 the normal boiling point of the liquid is 77.4 K and the critical point is at 126.2 K and 34.0 bar. Overview of the temperature and pressure dependence of the compressibility factor for N 2. The figure on the right shows an overview covering a wide temperature range.