Hydrogen

Hydrogen is the first element on the periodic table. It has an atomic weight of 1.00794, which makes it the lightest element there is. Hydrogen is the most common element as well. 75% of the entire universe is made up of hydrogen! Hydrogen can be found in many things, such as hydrogen peroxide ( 2 oxygen to 1 hydrogen ), water (2 hydrogen and 1 oxygen), and natural fuel. This fuel is being made to help stop air pollution, which is happening because of gas and oils from factories and cars.

Hydrogen gas is very flammable. It is used at many air bases for the launching of spaceships, and was related to the famous massive explosion of the Hindenburg Airship. Aside from making fuel ( it's main use ), hydrogen is also used in the creation of ammonia, a liquid that commonly goes into multi-purpose and window cleansers.
(Picture on right is of ammonia's molecular structure.)

In an acid/metal reaction in 1776, Henry Cavendish discovered Hydrogen. He also discovered that burning hydrogen created water. The word hydrogen comes from the Greek words "hydro", which means water, and the word "gene", which means creator. The name is perfect, since burning hydrogen DOES create water. Hydrogen is given the name H2, and in gas form at room temperature and under standard pressure is odorless, tasteless, and invisible.

Hydrogen can only exist as a liquid in two forms- one, when it is mixed with other elements and chemicals, and two, when it is kept under extreme pressure at a freezing cold temperature of -423 degrees Fahrenheit. I would think that it is easier to just mix the hydrogen with other elements such as oxygen, and create water, hydrogen peroxide, ammonia, and fuels. Hydrogen is so useful, and it is like a miracle that it is so easy to find.