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.
â¢ Hold your breath as long as you can (at least 5 seconds), then let the piston fall to the bottom of the air cylinder. â¢ Rest for a few seconds and repeat the steps above at least 10 times every hour while youâre awake. â¢ After each set of 10 deep breaths, do the coughing exercise above to keep your lungs clear.