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.
When someone breathes, they breathe in oxygen and then breathe out carbon dioxide. The breathing rate, or the number of times that a person breathes in and out in 1 minute, is often checked by health care professionals to determine the health of a person.The normal breathing rate is between 12 and 18 breaths per minute. Many factors affect a person's breathing.You must learn to test for breaths per minute and spot the reasons or causes behind slow or fast breathing. This article will tell you how to check the breathing rate.he normal breathing rate is between 12 and 18 breaths per minute. Many factors affect a person's breathing. You must learn to test for breaths per minute and spot the reasons or causes behind slow or fast breathing. This article will tell you how to check the breathing rate.