Radioisotope generator and rock drill: what they have in common

1. Step 1. Radioisotope generator — uses — Radioactivity. The decay heat of plutonium.
2. Step 2. Radioactivity — is used in — Cloud chamber. Particle tracks.
3. Step 3. Cloud chamber — has part — Piston. A sudden expansion supersaturates the vapour.
4. Step 4. Piston — is part of — Rock drill. A percussion piston.

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