This gas forms as a product of some types of anaerobic metabolism reactions and also some microorganisms can produce this gas. It is a colourless, odourless, tasteless and highly flammable gas. The molar mass of the hydrogen gas molecule is 2.016 g/mol.

The vast majority is in the form of hydrocarbons and water.

Most of the hydrogen on the earth is in the form of elemental hydrogen. As it is very light, this gas is rare in earth’s atmosphere because it escapes the gravity of earth. We can classify hydrogen gas as a diatomic gas because it has two hydrogen atoms. Hydrogen is the most abundant material on earth, taking up nearly 75% of the mass of all matter. Side by Side Comparison – Hydrogen vs Oxygen in Tabular Form Similarities Between Hydrogen and Oxygenĥ. Let us compare the two gases on the basis of their properties. But, the greatest benefit to us is in the chemistry between these two gases as it results in formation of water that is a necessity for us. There are many differences between hydrogen and oxygen. There is another gas, which we call as hydrogen that is equally important for us. It is one gas that supports all life forms. We are all aware of the importance of oxygen gas to all life forms, especially human beings. The key difference between hydrogen and oxygen is that the hydrogen is a very light gas whereas the oxygen is a heavy gas.

2 hydrogen 1 oxygen