Glowing gas discharge tube and camera: what they have in common

1. Step 1. Glowing gas discharge tube — is part of — Geiger counter. A tube with an inert gas.
2. Step 2. Geiger counter — uses — Radioactivity. It detects particles.
3. Step 3. Radioactivity — is used in — Cloud chamber. Particle tracks.
4. Step 4. Cloud chamber — evolved into — Bubble chamber. A liquid instead of vapour.
5. Step 5. Bubble chamber — has part — Camera. Photographing the tracks.

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