Division 2.5.2.1 Gases under pressure shall be classified, according to their physical state when packaged, in one of four groups in accordance with Table 2.5.1:F1
United Kingdom
| Table 2.5.1 | |
| Criteria for gases under pressure | |
| Note: Aerosols shall not be classified as gases under pressure. See section 2.3. | |
| Group | Criteria |
|---|---|
| Compressed gas | A gas which when packaged under pressure is entirely gaseous at – 50 °C; including all gases with a critical temperature ≤ – 50 °C. |
| Liquefied gas | A gas which, when packaged under pressure, is partially liquid at temperatures above – 50 °C. A distinction is made between:
|
| Refrigerated liquefied gas | A gas which when packaged is made partially liquid because of its low temperature. |
| Dissolved gas | A gas which when packaged under pressure is dissolved in a liquid phase solvent. |