氢
Hidrógeno · Водород · هيدروجين · Wasserstoff · Hydrogen · Hydrogène · Idrogeno · 水素 · 수소 · Hydrogenium · Waterstof · Wodór
| CAS | 1333-74-0 |
|---|---|
| EC | 215-605-7 |
| UN | 1049 |
| 分子式 | H2 |
| 摩尔质量 | 2.016 g/mol |
| 爆炸下限（LEL） | 4.0 % vol |
| 爆炸上限（UEL） | 77.0 % vol |
| 引燃温度 | 560 °C |
| 温度组别 | T1 |
| 气体组别 | IIC |
| 气体或蒸气的相对密度（空气 = 1） | 0.0696 |
| GHS | 危险 · H220 |
Dihydrogen is an elemental molecule consisting of two hydrogens joined by a single bond. It has a role as an electron donor, an antioxidant, a fuel, a human metabolite and a member of food packaging gas. Hydrogen is a colorless, odorless gas. It is easily ignited. Once ignited it burns with a pale blue, almost invisible flame.