[NuraDiggs]

Hi,

I was wondering if i could return the contents of an aerosol can back into the aerosol can after spraying. So the idea is to attach a copper tube to the nozzle and curve the tube back into the can. Any suggestions please?

[Borek]

Technically it is not different from just not opening the can at all - if the tube from the nozzle goes back into the can the pressure is identical on both ends and the gas won't move.

[NuraDiggs]

Ok. What if the copper tube is 1 metre long? And is bent like a refrigeration condenser, attached to a miniature air pump to push the content back into the can from the side? Mind you, the gas will only be released when nozzle is open. So i assume the pressure will remain inside the can.

[Borek]

It is not the length of the tube but its volume that's matters. You definitely can combine two tanks, one with higher pressure, the other with lower pressure, using a compressor and a release valve. Hard to tell whether it still counts as what you described, as your description is quite vague.