Final answer:
Aerosol systems involve the expansion of compressed air into lower-pressure air, causing a dispersal of matter. This process requires energy to disrupt the intermolecular forces within the canister. The canister may feel cold to touch because the exiting molecules draw energy from the surroundings.
Step-by-step explanation:
This process entails both a greater and more uniform dispersal of matter as the compressed air in the canister is permitted to expand into the lower-pressure air of the room. The process also requires an input of energy to disrupt the intermolecular forces between the closely-spaced gas molecules that are originally compressed into the container. If you were to touch the nozzle of the canister, you would notice that it is cold because the exiting molecules are taking energy away from their surroundings, and the canister is part of the surroundings.