Glowing gas discharge tube and r-7 rocket: 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 — is made of — Ethanol. It is saturated with alcohol or water vapour.
5. Step 5. Ethanol — is material for — V-2 rocket. The fuel is ethyl alcohol.
6. Step 6. V-2 rocket — evolved into — R-7 rocket. The Soviet rocket programme began by studying the V-2 (the R-1 was its copy).

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