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Criteria for gases under pressure
A gas which when packaged under pressure is entirely gaseous at – 50 °C; including all gases with a critical temperature ≤ – 50 °C.
A gas which, when packaged under pressure, is partially liquid at temperatures above – 50 °C. A distinction is made between:
(i) high pressure liquefied gas: a gas with a critical temperature between – 50 °C and + 65 °C; and
(ii) low pressure liquefied gas: a gas with a critical temperature above + 65 °C.
Refrigerated liquefied gas
A gas which when packaged is made partially liquid because of its low temperature.
A gas which when packaged under pressure is dissolved in a liquid phase solvent.
Aerosols shall not be classified as gases under pressure. See section 2.3.