Hello my all steemians lover. On this occasion i will share an information about Air Preasure.
All of us know that solids and liquids have pressure. But what about gas? Does gas also have pressure too? Have you seen a hot air balloon? How does a hot air balloon fly?
What is gas?
Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma). A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). Source
What happened to the erlenmeyer covered with a rubber balloon? When the water is in erlenmeyer which is covered with a heated rubber balloon will make the rubber balloon expand. This matter occurs because the gas particles in the erlenmeyer receive heat from the heating.
Pressure is a force exerted by the substance per unit area on another substance. The pressure of a gas is the force that the gas exerts on the walls of its container. When you blow air into a balloon, the balloon expands because the pressure of air molecules is greater on the inside of the balloon than the outside.
As a result the movement of gas particles in erlenmeyer faster and there is expansion so that the pressure becomes big. The pressure inside the erlenmeyer is continued as large as the rubber balloon, so the pressure inside the rubber balloon is greater than the gas pressure outside the rubber balloon causing the rubber balloon to expand.
When the embers from the burner heats the air in the balloon, the weight of the balloon becomes smaller than the upward force so the balloon will move up (Remember, hot air is lighter than cold air). If you want to go down, then the air heating in the balloon is reduced or is stopped so that the air temperature in the balloon decreases. The upward force in the balloon is the same as the weight of cold air being moved by the balloon. Recall the laws of Archimedes!