Mizu is my best friend.

In the old days, people used to draw water directly from the river and drink it.

Please give me a glass of water.

He drank water.

Hydrocarbons are fundamental components of organic chemistry.

He was involved in the development of the hydrogen bomb.

Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.

This compound is stabilized by hydrogenation.

He hydrogenated fatty acids in a chemical experiment.

I maintain my health by doing aerobic exercises every day.