Critical Pressure (liquid-vapor)
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PCritical=Selection[Water]
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The Critical Pressure (liquid-vapor) utility provides the liquid-vapor critical pressure for a chosen material.
INSTRUCTIONS: Enter the following:
- (S) Choose the Substance:
- Argon, Ammonia, Bromine, Caesium, Chlorine, Ethanol, Fluorine, Helium, Hydrogen, Krypton, CH4 (Methane), Neon, Nitrogen, Oxygen, CO2, N2O, H2SO4, Xenon, Lithium, Mercury, Sulfur, Gold, Water
Critical Pressure (liquid-vapor) (CP): The function returns the critical pressure in kilo pascals (kPa). However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
This critical pressure point occurs at specific conditions above which distinct liquid and gas phases do not exist. There are multiple critical points, including liquid-vapor and liquid-liquid critical points.
This equation provides the liquid-vapor critical pressure for a number of selectable substances expressed in kPa.
The critical pressure for the chosen substance provided by this equation equates to the pressure value, Pcr, shown in the image.
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