Matchbox striker strip and liquid-propellant rocket engine: what they have in common

1. Step 1. Matchbox striker strip — is part of — Match. Red phosphorus on the side.
2. Step 2. Match — uses — Combustion. Combustion.
3. Step 3. Combustion — uses — Oxygen. It needs oxygen.
4. Step 4. Oxygen — is material for — V-2 rocket. The oxidizer is liquid oxygen.
5. Step 5. V-2 rocket — is a kind of — Liquid-propellant rocket engine. A liquid-propellant engine.

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