They use organic compounds or molecular hydrogen as the energy source.

This means molecular hydrogen, H, is combined with oxygen to form water.

A third approach is to adsorb molecular hydrogen on the surface of a solid storage material.

Although there was once molecular hydrogen (H) in the atmosphere, it escaped into space to leave behind oxygen.

By the early 1960s it was established that molecular hydrogen (H 2 ) is the dominant constituent.

Frozen formaldehyde and molecular hydrogen may also be present.

Figure 9.9 shows the measured phase-diagram of molecular hydrogen.

The nitrogenase reaction additionally produces molecular hydrogen as a side product.

The outer atmosphere of Saturn contains 96.3% molecular hydrogen and 3.25% helium.

One swipe with molecular hydrogen and Earth's oxygen would combine, making water and a lot of energy.