Aerosol Sprays

By: Darius Wilson and Metztonalli Garcia

Aerosol Spray

Aerosol spray is a type of system that dispenses and creates and aerosol mist of liquid particles. This is usually when a can or bottle contains liquid under pressure.

History

The concept of aerosol sprays go back as far as 1790. In 1939 American Julian S. khan received a patent for a disposable spray can. His idea was to mix a cream with a propellant to make whipped cream at home-not a true aerosol really. It was not until 1941 that the aerosol can was used by Americans Lyle Goodhue and William Sullivan. The small portable can pressurized by liquefied gas allowed soldiers to defend against Malaria carrying mosquitoes during World War II.

Gas Law: Boyle's Law

As pressure increases the volume will decrease and as the pressure decreases the volume will increase because there is more room for the gas to expand. The temperature is held constant.

Boyle's law and how it relates to aerosol cans

While there are a couple different types of aerosol cans, each one more elaborate than the other, they both operate off of the same basic principle: Boyle's law. For example a spray can of paint.

before you use a can of paint you are supposed to shake the can. There are 2 substances inside the can, one being your product, which in this case is paint and the other being a gas that can be pressurized so much, that it retains a liquid state even when it is heated past its boiling point. This liquefied gas will be a substance that has a boiling point far below room temperature. The can is sealed, preventing this gas from boiling and turning into a gaseous state. That is, until you push down the nozzle. The moment the nozzle goes down, and the seal is released, there is now an escape route. The propellant instantly boils and expands into a gas and pushes down on the product trying to escape the high pressure, and expand it's volume the atmosphere where there is less pressure. This forces the product to shoot out from the nozzle up the dip tube, and you have your paint.

Boyle's Law and Marshmallows.wmv