What is the most abundant gas in the Earth's atmosphere?

The most abundant gas in Earth's atmosphere is nitrogen. It makes up about 78% of the total volume of the atmosphere. Oxygen is the second most abundant gas, making up around 21% of the atmosphere. The remaining 1% is made up of trace gases such as argon, carbon dioxide, neon, helium, methane, krypton, hydrogen, and xenon.

Nitrogen is an important component of the atmosphere and plays a vital role in sustaining life on Earth. It is an essential nutrient for plants and animals and is a key component of proteins, nucleic acids, and other biological molecules. Nitrogen is also used in the manufacturing of fertilizers, industrial chemicals, and other products.