Stimulated emission and heat pump: what they have in common

1. Step 1. Stimulated emission — is used in — Maser. The same principle in microwaves.
2. Step 2. Maser — is made of — Ammonia. The first maser ran on ammonia.
3. Step 3. Ammonia — is material for — Refrigerant. Ammonia was one of the first refrigerants.
4. Step 4. Refrigerant — is material for — Air conditioner. Inside is a refrigerant.
5. Step 5. Air conditioner — uses — Heat pump. An air conditioner is a heat pump that carries heat out of the room.

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