Description : The carbon dioxide content in the air that we exhale is about - (1) 4% (2) 8% (3) 12% (4) 16%
Last Answer : (1) 4% Explanation: Carbon dioxide exists in Earth's atmosphere in this state, as a trace gas at a concentration of 0.039 per cent by volume. The air we breathe in contains about 0. ... In other words, exhaled air contains about 100 times the concentration of carbon dioxide that inhaled air does.