# Why isn’t there much hydrogen found in the atmosphere?

Feb 7, 2016

The reason there is not much hydrogen in the atmosphere is because it is lighter than air, and so can easily escape the Earth's gravity.

#### Explanation:

Hydrogen,${H}_{2}$, is one of the lightest gases that can be found on Earth. The other gas is helium, and these two gases are both lighter than air, because they have a high degree of buoyancy.

This means that the air below it is pushing up with a greater force than the air above it is forcing it down.