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| hydrogen (hydrogenium) | |||
| hydrogen A flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding | |||
| hydrogen: 43 phrases in 10 subjects |
| Chemistry | 7 |
| Earth sciences | 8 |
| Electronics | 7 |
| Energy industry | 9 |
| General | 1 |
| Hobbies and pastimes | 1 |
| Metallurgy | 3 |
| Natural sciences | 3 |
| Technology | 1 |
| Transport | 3 |