Bolt and nut and autoclave: what they have in common

1. Step 1. Bolt and nut — is used in — Wrench. A wrench turns nuts.
2. Step 2. Wrench — has part — Ratchet. A ratchet wrench.
3. Step 3. Ratchet — has part — Spring. The pawl spring.
4. Step 4. Spring — is part of — Safety valve. A spring-loaded valve.
5. Step 5. Safety valve — is part of — Autoclave. A safety valve releases pressure.

Open Evothings