Ferris wheel and aerosol can: what they have in common

1. Step 1. Ferris wheel — works like — Bicycle wheel. A giant wheel with spokes in tension.
2. Step 2. Bicycle wheel — has part — Pneumatic tyre. The tyre softens bumps and improves grip.
3. Step 3. Pneumatic tyre — is made of — Synthetic rubber. Modern tyres are mostly synthetic rubber.
4. Step 4. Synthetic rubber — is a kind of — Polymer. An elastomer.
5. Step 5. Polymer — is material for — Hair spray. The hairstyle is held by the polymer film left once the solvent evaporates.
6. Step 6. Hair spray — uses — Aerosol can. Hair spray comes out of an aerosol can as fine droplets, so it settles as an even film.

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