Photographic film and rocket: what they have in common

1. Step 1. Photographic film — is made of — Celluloid. The first flexible film was celluloid.
2. Step 2. Celluloid — is made of — Cellulose. Nitrocellulose.
3. Step 3. Cellulose — is material for — Smokeless powder. Nitrocellulose.
4. Step 4. Smokeless powder — is material for — Solid rocket motor. The propellant is smokeless powder.
5. Step 5. Solid rocket motor — evolved from — Rocket. Gunpowder rockets.

Open Evothings