To study the role of air in each activity.
Air, the gaseous mixture that makes up the Earth's atmosphere. Gases with concentrations that are changeable in both location and time and a group of gases with concentrations that are almost constant are present in the mixture. The invisible gas mixture that envelops Earth is called air. Most organisms depend on essential elements like oxygen and nitrogen found in air to exist. In some cases, "atmosphere" is used in place of "air."