Air Pressure although the air around us is invisible, it is actually a mixture of gases that includes oxygen, carbon dioxide and nitrogen. Air is therefore a substance with weight.
Because air has weight,it is all around us because the earth's gravity keeps the atmosphere on earth.And because air has weight, it means it can also exert pressure.
In this Air pressure kit, you will find four fabulous experiments that make use of air pressure.
• Learn about properties of air pressure