What Is The Most Abundant Gas In The Atmosphere?

What Is The Most Abundant Gas In The Atmosphere?

Earth’s atmosphere is made of different gases. When we breathe, many people think we are mostly breathing oxygen. But the truth is, most of the air around us is actually nitrogen!

Nitrogen is the most common gas in the atmosphere. It makes up about 78% of the air. That means if you could divide the air into 100 parts, 78 of those parts would be nitrogen. Oxygen comes next, making up about 21% of the air. The rest is made up of argon (about 1%) and tiny amounts of carbon dioxide, water vapor, and other gases—less than 1% combined.

Nitrogen is special. Even though we breathe it in and out, our bodies do not use nitrogen directly from the air. Instead, plants need nitrogen from the soil to grow. This is why many fertilizers have nitrogen. Bacteria in the soil change nitrogen gas into forms plants can use. Animals eat the plants and get nitrogen for their bodies. When plants and animals die and decompose, nitrogen goes back into the soil. This movement is called the nitrogen cycle.

Nitrogen is important for many reasons. It helps dilute oxygen so fires do not burn too fast. It is needed for plants to make proteins, which are important for all living things. Nitrogen is also used to keep food fresh—like keeping potato chips crispy in their bags!

We do not notice nitrogen because it is colorless, odorless, and does not react much. It is like the main topping on a pizza you cannot see or taste, but it is still there. If the atmosphere was a pizza with 100 toppings, 78 would be nitrogen, 21 would be oxygen, and just 1 would be everything else!

Interesting Fact: Light bulbs are filled with nitrogen gas, and liquid nitrogen is so cold it can freeze things instantly in science experiments!