Ammonia and micrometer: what they have in common

1. Step 1. Ammonia — is made of — Hydrogen. Hydrogen.
2. Step 2. Hydrogen — is used in — Airship. Zeppelins were filled with hydrogen.
3. Step 3. Airship — has part — Propeller. Air propellers.
4. Step 4. Propeller — uses — Screw. A propeller “screws” itself into the water, like an Archimedes’ screw.
5. Step 5. Screw — is used in — Micrometer. A precise screw with a 0.5 mm pitch.

Open Evothings