Why are aerosol cans e.g. deodourant cold to touch?

Question

Is it something to do with the pressure i.e. the atmospheres inside the can, compressing the gas into liquid form?

Any info would be much appreciated...

Answer 1

Because they squeeze alot of the fluid into the container it becomes compressed, when it compresses it becomes hotter and when you spray, it decompresses and goes colder and colder.

Answer 2

Yes, you're right. The material in the can is a liquid 'Gas' i.e. a gas compressed until it changes to liquid.
The substance used in the can may be Butane that, at about 15psi above atmospheric, will remain as liquid in the can at room temperature.
Releasing the pressure in the can causes the Butane to boil and vaporise. Vaporisation of a liquid needs heat energy. The heat comes from the contents of the can which cool down while providing this heat and, ergo, the can becomes cold.
(Butane when boiling at atmospheric pressure has a temperature of -0.5°C (31°F)).

Answer 3

This is following the PV=RT formula. The temp outside received evaporate the liquid inside. Turn into gaseous state from liquid. work done by that. Molecule move will lose energy temp will godown by increasing pressure. So just try keep the container near hot temp (furnace) . The pressure will rise due to above reason before the body getting heated up and burst.
Again there is a question why not the body heated because of conductivity metal strength . gas pressurespecific heat of gas. The gas pressure work fastly . Hope you will understand
Thankyou

Answer 4

Yes it is all to do with expansion and usually volatilisation of the propellant gas. All gases cool as they expand. However, the aerosol can is only cold just after you use it. Just before you use it, all contents are at ambient temperature.

Answer 5

Pressure is proportional to temperature....as you release the deodorant the pressure inside the can goes down and therefore so does the temperature

Answer 6

It's the gas! Try thinking "fridge"