Waterjet cutting and petri dish: what they have in common

1. Step 1. Waterjet cutting — uses — Pressure. A pressurized jet.
2. Step 2. Pressure — is used in — Compressor. It compresses air.
3. Step 3. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.
4. Step 4. Sewage treatment plant — uses — Culture medium (agar). Waste water is cleaned by activated sludge — bacteria.
5. Step 5. Culture medium (agar) — uses — Petri dish. Agar in dishes.

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