Maser resonant cavity and turbojet engine: what they have in common

1. Step 1. Maser resonant cavity — is part of — Maser. A cavity tuned to the transition frequency.
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 — has part — Compressor. A compressor.
6. Step 6. Compressor — is part of — Turbojet engine. The compressor compresses the air.

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