Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which contains both of those minerals) and is the main component of pearls and the shells of marine organisms, snails, and eggs.
An ordinary breath for a 70-kg adult is about 500ml of air. We call this the tidal volume. Since oxygen is 21% by volume of air, then the volume of oxygen inhaled is about 105ml. The density of pure oxygen at sea level is 1.43kg per cubic metre.
You rest ian enough air to prevent that even after you force as much air from your lungs as you can. CÃ n for example take as deep of a breath as you. Can hold for a few. Seconds now purse your lips and make an s sound and breathe out until you`can t make any. noise