Polyvinyl chloride (PVC) and petri dish: what they have in common

1. Step 1. Polyvinyl chloride (PVC) — is material for — Cling film. Cling film was made of PVC; now it is more often polyethylene.
2. Step 2. Cling film — is made of — Polyethylene. Polyethylene.
3. Step 3. Polyethylene — is material for — Surgical mask. Non-woven polypropylene.
4. Step 4. Surgical mask — uses — Germ theory of disease. Protection against droplets.
5. Step 5. Germ theory of disease — is used in — Petri dish. Growing bacterial cultures.

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