Sunscreen and heat pump: what they have in common

1. Step 1. Sunscreen — uses — Ultraviolet. It absorbs UV.
2. Step 2. Ultraviolet — is used in — Fluorescent lamp. UV excites the phosphor.
3. Step 3. Fluorescent lamp — uses — Plasma. A discharge in mercury vapour.
4. Step 4. Plasma — is used in — Plasma cutting. Plasma.
5. Step 5. Plasma cutting — has part — Compressor. Supplying the plasma gas.
6. Step 6. Compressor — is part of — Heat pump. A compressor.

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