Quill pen and aerosol can: what they have in common

1. Step 1. Quill pen — uses — Capillary action. Ink is held in the shaft by capillary action.
2. Step 2. Capillary action — is used in — Wick. Fuel rises up the wick by capillary forces.
3. Step 3. Wick — is part of — Davy lamp. A wick.
4. Step 4. Davy lamp — evolved into — Carbide lamp. Miners’ lamps.
5. Step 5. Carbide lamp — has part — Valve. It regulates the water supply.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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