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.
A person who is breathing at four breaths a minute will only breathe about 5,760 times a day. At the ânormalâ breathing rate of eight breaths a minute that count doubles to 11,520 breaths a day. At 16, which is still slow for many ill people, that rate reaches to 23,000 breaths a day. At 25 breaths a minute, we are clipping along at 36,000 breaths a day, which is a far cry above a normal rate.