Roughly 318 ppm (parts per million), or 0.0318% compared to 392 ppm currently (March 2011).
The source of Oxygen is the Carbondioxide in the air.
The percentage of nitrogen in pure, dry ,standard air is 78,084 % (by volume).
The level of carbon dioxide in air from remote locations is 0.0385% by number of molecules 0.0578% by mass City air or indoor air typically has significantly higher carbon dioxide levels. This has increased from about 0.031% by molecule (0.046% by mass) in the last century, and a pattern for the previous 400,000 years between 0.020% (0.030%) in the ice ages and 0.028% (0.042%) in the warmer interglacial periods.
About 21% of inspired air is oxygen.
Carbon dioxide is a compound, not an element. It does not have an atomic number.
Carbondioxide
The source of Oxygen is the Carbondioxide in the air.
To smell the water and better protect themselves
when the groundwater is exposed to the air the carbondioxide present in the air gets dissolved in the water due to which the ph of groundwater decreases
The person breathes in oxygen and breaths out carbondioxide back into the spirometre. Because the carbondioxide can become a saftey hazard, soda lime is placed in the spirometre to remove the carbondioxide, however the volume of carbondioxide is equal to the volume of oxygen, as the oxygen is not being replace, so removing the carbondioxide removes the oxygen as well, making the spirometre drop.
carbondioxide
j.black
Carbondioxide
we breath carbondioxide
No, it isn't. Both are homogeneous mixtures, but .... :Air is a mixture of gases, mainly of nitrogen, oxygen, carbondioxide and water vapor.Amalgam is (homogeneous) mixture of metals, of which essentially one is mercury (Hg)
Photosynthesis occurs in the leaves of all plants during sunlight exposure releasing oxygen into the air and using carbondioxide in the air to make it...
plants. when humans exhale carbondioxide, plants take it in and turn it back into oxygen. especially trees