Bleach and heat pump: what they have in common

1. Step 1. Bleach — is used in — Antisepsis. Chlorine bleach kills germs and is used to disinfect.
2. Step 2. Antisepsis — uses — Germ theory of disease. Lister relied on Pasteur’s work.
3. Step 3. Germ theory of disease — uses — Culture medium (agar). Koch’s postulates.
4. Step 4. Culture medium (agar) — is used in — Sewage treatment plant. Waste water is cleaned by activated sludge — bacteria.
5. Step 5. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
6. Step 6. Compressor — is part of — Heat pump. A compressor.

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