| use hydrogen | 2.04 | Fuel cells use hydrogen to create electricity. | ||
| produce hydrogen | 1.12 | The hard part has always been producing the hydrogen. | ||
| extract hydrogen | 0.86 | The cell must be plugged into the mains overnight to extract the hydrogen. | ||
| combine hydrogen | 0.46 | A fuel cell produces energy from a chemical reaction when hydrogen is combined with oxygen. | ||
| store hydrogen | 0.39 | This made it easier to store the hydrogen, but also made a car that was tremendously complex and costly. | ||
| contain hydrogen | 0.33 | They directed the beams at targets containing liquid hydrogen. | ||
| make hydrogen | 0.33 | We have also seen that hydrogen is made as a byproduct of the makeup of oxygen by electrolysis of water. | ||
| release hydrogen | 0.26 | They found some residue on the outside of the vent, which releases waste hydrogen into space. | ||
| take hydrogen | 0.26 | German industry, however, is taking hydrogen seriously and is trying to solve these problems. |