My flatmate tried to "compressed air" his laptop once using his lab's compressor. Didn't turn the laptop off. Only two fan blades survived.

We glued the other blades back on to tide him over until a replacement arrived, but each day one or two would break off and we'd have to give the laptop a good shake to expel them.

...it's often difficult to know how precise one must be when advising flatmates about compressed air.

Those "gas duster" cans don't contain compressed air. It's a mixture of volatile solvents.

They used to be a CFC like R12 before the ozone depletion was known, now they are a HFC like R134a or R152a.

...which also means they are a cheap source of refrigerant. Look up "charging A/C with gas duster" if you want to go down a rabbithole...

Yes, it's true. You can see this for yourself if you turn the can upside down while you press down the button on the top. Then, it will spray liquid solvent out, which will immediately vaporize, and therefore rapidly chill anything it's on.

In my former life debugging signal timing issues on circuit boards I used to use this trick (using those "gas duster" cans upside down) to chill individual components to try to find out where the problem was.