Tetra Pak and boyle’s air pump: what they have in common

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

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