Mountain bike and aerosol can: what they have in common

1. Step 1. Mountain bike — has part — Suspension fork. A suspension fork.
2. Step 2. Suspension fork — has part — Shock absorber. A shock absorber.
3. Step 3. Shock absorber — has part — Piston. Inside, a piston moves in oil.
4. Step 4. Piston — is part of — Boyle’s air pump. A plunger.
5. Step 5. Boyle’s air pump — has part — Valve. Valves.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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