X-rays and aerosol can: what they have in common

1. Step 1. X-rays — uses — Vacuum. Röntgen discovered the rays while experimenting with a discharge in an evacuated Crookes tube.
2. Step 2. Vacuum — is used in — Boyle’s air pump. The pump draws out the air.
3. Step 3. Boyle’s air pump — has part — Valve. Valves.
4. Step 4. Valve — is part of — Aerosol can. A valve.

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