The boiling point of any substance is also known as its saturation temperature. This property refers to point at which liquid vapour pressure equals pressure surrounding a liquid, which then changes to vapour. A liquid within a vacuum has a lower BP compared to when it is at atmospheric pressure. At high pressure, the liquid will have a higher BP than when at atmospheric pressure.
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The heat of vaporization is the temperature at which an element is transformed from fluid into gas at a certain pressure. This process is calculated at boiling point of an element. The units of measurements are in J/mol or Kj/mol (molar enthalpy of vaporization). However, units like kj/kg or J/g are used as well as older divisions like cal/g and kcal/mol are also functional.