The composition of air is usually sated as a dry composition (without water vapour). About 21% is oxygen. The rest is mostly Nitrogen (78%) and Argon (1%). Carbon Dioxide at 300ppm is the next largest with other gases at trace amounts
Population: Werewolves: 15 percent of earths population Vampires: 45.2 percent of the earths population Humans: 2 percent of the earths population wookies: 1 percent of the earths population witches and warlocks: 5.8 percent of earths population Actual real animals (you know normal stuff): 31 percent of the earths population
Approximately 21% of the air is oxygen, which we use for breathing. The remaining 78% is nitrogen, which is mainly inert and not used for respiration.
A face mask typically provides around 21% of oxygen, which is the same concentration as the air we normally breathe.
45well there is an exact answer so i would say most of it because the air is full of oxgen and there is lots of trees
An oxygen concentrator works by pulling in air, removing nitrogen through a filtration process, and delivering concentrated oxygen to the user through a nasal cannula or mask. The device uses a molecular sieve bed to separate oxygen from nitrogen in the air, providing a higher concentration of oxygen for people with breathing difficulties.
Oxygen is the gas that accounts for about 20 percent of Earth's atmosphere.
97%
The percent of oxygen in dry air is approximately 21%.
Oxygen makes up 21 percent of the air by volume.
The approximate percent of oxygen in Earth's lower atmosphere is around 20.95% by volume.
The Crust has the most oxygen in it
nitrogen and oxygen
oxygen
oxygen! There is 21 percent oxygen in inspired ( the stuff you breath in) air and 13 percent in expired(the stuff you breath out)
The Earth's atmosphere is composed of about 21% oxygen. This level is important for supporting life on our planet.
Air is 20.5 percent oxygen.
Approximately 20 percent of the Earth's atmosphere is made up of oxygen.