Other materials that are not combustible or only very slightly combustible under normal conditions can become very combustible and hazardous when oxygen levels are high. Also, many things will be hot or will smolder when deprived of air and will suddenly burst into flames when exposed to the oxygen that's in our air. Since oxygen is required for the burning we see, the sudden combustion in these examples would be more dangerous if the oxygen concentration were higher.
Oxygen is the second most abundant gas in Earth's atmosphere, making up about 21% of the air we breathe.
The two most abundant gases in Earth's atmosphere are nitrogen (about 78%) and oxygen (about 21%).
oxygen
Nitrogen is the most abundant gas in Earth's atmosphere, followed by oxygen, argon, and carbon dioxide.
The three most abundant gases in Earth's atmosphere are nitrogen (78%), oxygen (21%), and argon (0.93%).
The most abundant gases are nitrogen and oxygen in the Earth atmosphere.
Oxygen is the second most abundant gas in Earth's atmosphere, making up about 21% of the air we breathe.
The second most abundant gas in the Earth's atmosphere is oxygen, which makes up about 21% of the gases in the atmosphere.
Nitrogen is the most abundant element in the earth's atmosphere.
The two most abundant gases in Earth's atmosphere are nitrogen (about 78%) and oxygen (about 21%).
oxygen
Nitrogen (N2) is the most abundant gas in the Earth's atmosphere having percent volume of 78.8 compare to Oxygen 20.95 %, which falls on the second place after Nitrogen.
Oxygen
These elements are nitrogen, oxygen and argon.
Oxygen is the second most abundant gas in Earth's atmosphere, making up about 21% of the air we breathe.
The most abundant nonmetal gases in the atmosphere are nitrogen, oxygen, and argon. Nitrogen makes up about 78% of the atmosphere, followed by oxygen at around 21%, and argon at approximately 0.93%.
Nitrogen is more abundant; our atmosphere is 78% Nitrogen.