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You cannot see, taste, or smell hydrogen, yet this element makes upover 90 per cent of matter. The Sun and stars are made of hydrogen gas. On Earth, hydrogen forms compounds (mixture of elements), and is found in almost every living thing. Hydrogen gas is used to make chemicals such as ammonia, which is needed to make fertilizers. Hydrogenis also used to increase the amount of petrol produced from crude oil.
Stars are fuelled by hydrogen. At incredibly high temperatures inside stars, hydrogen atoms smash into one another and fuse (join) together to create helium atoms. These reactions give out a huge amount of energy as light and heat. Hydrogen atoms were probably the first atoms to form in the Universe and fuse together to create other, heavier atoms.
The space shuttle uses liquid hydrogen fuel because hydrogen gives out a lot of power for very littleweight. Hydrogen, like all fuel, needs oxygen to burn, so the shuttle has a tank of liquid hydrogen and a tank ofliquid oxygen. A fine mist of the two liquids is sprayed into the engines and ignited (set alight). The hydrogen explodes, sending steam out of the nozzles and helping to thrust the shuttle into space.
Margarine is made by passing bubbles of hydrogen gas through hotvegetable oil. Extra hydrogen atoms bond (join) with the oil molecules, and the oil changes from a liquid to a more solid form. This process is calledhydrogenation. If oil is fully hydrogenated, it becomes completely solid; by stopping part way, it becomes a semi-solid.
Scientists are developing hydrogen-powered cars. The cars contain tanks of hydrogen that combine with oxygen from the air to drive them. Hydrogen-fuelled cars produce water instead of polluting exhaust gases. They are not mass-produced, becausescientists have not developed a compact and lightweight method forstoring hydrogen yet.
This chemist is often known as the father of modern chemistry. He studied the “inflammable air” that was discovered by English scientist Henry Cavendish (1731–1810). Lavoisier discovered that this gas combines with oxygen to make water. He named the gas hydrogen, which is Greek for water-former.

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