Mineral fertilizer and air conditioner: what they have in common

1. Step 1. Mineral fertilizer — is made of — Ammonia. Nitrogen fertilizers.
2. Step 2. Ammonia — is material for — Refrigerant. Ammonia was one of the first refrigerants.
3. Step 3. Refrigerant — is material for — Air conditioner. Inside is a refrigerant.

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