That, because pressure and temperature have a direct relationship and pressure and volume have an indirect relationship, crushing (decreasing the volume) and adding heat (increasing the temperature) will cause the aerosol can to exceed its pressure limitation and may explode.
This phase is called the crescent moon. (3) Quarter Moon - A week after the new moon, when the Moon has completed about a quarter of its turn around the Earth, we can see half of the illuminated part; that is, a quarter of the Moon. This is the first quarter phase.
The number of protons, neutrons and electrons an atom has determines what element it is. Hydrogen, for example, has one proton, no neutrons and one electron; the element sulfur has 16 protons, 16 neutrons and 16 electrons.