Hair spray and particle accelerator: what they have in common

1. Step 1. Hair spray — uses — Aerosol can. Hair spray comes out of an aerosol can as fine droplets, so it settles as an even film.
2. Step 2. Aerosol can — has part — Valve. A valve.
3. Step 3. Valve — is part of — Boyle’s air pump. Valves.
4. Step 4. Boyle’s air pump — uses — Vacuum. The pump draws out the air.
5. Step 5. Vacuum — is used in — Particle accelerator. A vacuum chamber.

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