How Aerosol Cans Work

When spray painting, it is important to understand how aerosol cans work. Aerosol cans are preferred because they are easy to use, durable and sprays the paint in a very efficient way. WRX Spray Paint is a ready to use aerosol, for protective and decorative purposes. WRX’s unique spray nozzles deliver a 50-50 paint-gas, first phase spray, every time.

There are two types of aerosol cans. One uses propellant in a gas form and the other uses liquefied gas. Most of the aerosol cans these days use liquids as propellants since in the 1980’s, scientists discovered that the gas propellants harm the ozone layer. WRX Spray Paint uses liquid propellants and is completely ozone friendly.

What is Inside an Aerosol Can?

The mixture inside the can doesn’t just consist of paint, it also contains a propellant that helps paint to spray outside the nozzle with a certain pressure. The propellant is a liquefied gas that has been highly compressed.

Ever wondered what does the ball inside the can is for? It serves a very imporant purpose indeed. Before using a spray paint, you should always make sure you shake the can very well so that the propellant and the paint is mixed well. The ball moves inside the liquid when you shake it and makes the mixture more even. This results in a more even coat and a perfect finish.

The Mechanics of How Aerosol Cans Work

How aerosol cans work can be explained by simple physcs. When producing aerosol cans, first the paint is poured into the can. Then the can is sealed and propellant is pumped in under a certain pressure. Because the pressure forces the particules to move closer, the gas turns into liquid, even if the temprature is above its boiling point. Since the paint is already liquid, it doesn’t need to be pumped in the can with pressure like the propellant.

The pressure that is built up inside the aerosol can is releaved once the valve is open. When the pressure lowers, this causes the propellant particles to break free and turn into gas. The propellant then forms a layer of gas on top of the can. This leaves the liquid paint in the bottom of the can. It is then pushed outside the tube because of the pressure from the propellant sitting on top of the can now that it is in gas form. As a result, the paint and the propellant comes out in a spray form through the nozzle.

You might have noticed that the aerosol can gets cold when you spray. This is because the liquid evaporates when the pressure is reduced. The molecules move away from each other and turn into gas. Some energy is required for the molecules to move apart and this is provided from the enviroment. So it is completely normal for the can, the tip and the paint to get cold when you spray.

Now that you know how aerosol cans work, you can spray paint like a pro! Enjoy.

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