| Pressure and boiling point |
| The boiling points given in the table below are always based on an atmospheric pressure of 1 bar. Modifying the pressure of a liquid causes its boiling point to vary. |
| It is well known that water, for example, reaches its boiling point at lower temperatures when the pressure is reduced. |
| From the vapour pressure curves for water and refrigerant R134a, it can be seen that, for example, with a constant pressure, the vapour turns into water (in the condenser) if the temperature decreases, and that, for example, by decreasing the pressure, the refrigerant changes from a liquid state into a vapour state (evaporator). |
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