The cloud of liquid dispersed in gas that shoots from an aerosol can. This is from our article about how aerosol cans work.
You can't normally see an aerosol spray this well, but you can photograph it fairly easily by turning the lights out at night, pressing down on your can, and using flash. If you're taking a photo like this, watch where the spray is going... and be careful that you're not making your floor super slippery. New aerosols are usually more powerful than old ones, so they will give a different flow pattern.
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