Metal Spray Can Operating Principle

Metal Spray Can Operating Principle

If you apply enough energy to the fluid (e.g., by heating it), the particles in the fluid will vibrate so violently that they break the forces holding them together. In this way, the liquid becomes a gas and becomes a fluid that can move independently. 

This is the process of boiling, and the temperature at which it boils is called the boiling point of the substance. Different substances have different boiling points (for example, it takes more heat to change water from liquid to gas than it does alcohol from liquid to gas).

The forces of the individual moving particles in a gas can add up to a considerable pressure. Because the particles in a gas are not bound together, a gas does not have a fixed volume like a liquid, and the particles are constantly pushing outward. 

In this way, the gas will expand and fill all the open space. As a gas expands, its pressure decreases (fewer particles collide with each other in any given area, so the pressure also decreases). 

When a gas is compressed into a relatively small space, it can create a lot of pressure (because there are more moving particles in a certain area). Aerosol tanks use these principles for a simple purpose: to push a liquid substance out.