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A liquified gas 💧 is the liquid form of a substance which, at ambient temperature and at atmospheric pressure, would be a gas 💭.
The most important of a liquefied gas 💧, in relation to pumping and storage, is its saturated vapour pressure 📈. This is the absolute pressure exerted when the liquid is in equilibrium with its own vapour at a given temperature.
The Gas Carrier Codes relates saturated vapour pressure to temperature 🌕 and has adopted the following definition the liquified gases carried by sea :
👉 Liquids with a vapour pressure exceeding 2.8 bar absolute at a temperature of 37.8°C".
An alternative way of describing a liquified gas 💧 is to give the temperature at which the saturated vapour pressure is equal to atmospheric pressure - in other words the liquid's atmospheric boiling point.
Source : McGuire&White
