F-1 rocket engine and heat pump: what they have in common

1. Step 1. F-1 rocket engine — is part of — Saturn V. Five kerosene–oxygen engines on the first stage.
2. Step 2. Saturn V — uses — Hydrogen. Hydrogen stages.
3. Step 3. Hydrogen — is material for — Ammonia. Hydrogen.
4. Step 4. Ammonia — is material for — Refrigerant. Ammonia was one of the first refrigerants.
5. Step 5. Refrigerant — is material for — Air conditioner. Inside is a refrigerant.
6. Step 6. Air conditioner — uses — Heat pump. An air conditioner is a heat pump that carries heat out of the room.

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