Waterproof outer film and boyle’s air pump: what they have in common

1. Step 1. Waterproof outer film — is part of — Disposable nappy. Film.
2. Step 2. Disposable nappy — is made of — Polyethylene. Film.
3. Step 3. Polyethylene — is material for — Cling film. Polyethylene.
4. Step 4. Cling film — is used in — Vacuum sealer. Film.
5. Step 5. Vacuum sealer — has part — Vacuum pump. A pump.
6. Step 6. Vacuum pump — evolved into — Boyle’s air pump. An improved version of Guericke’s pump.

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