Electrolyser and radio: what they have in common

1. Step 1. Electrolyser — uses — Electrolysis. Electrolysis of water.
2. Step 2. Electrolysis — is used in — Hydrogen. Hydrogen is produced by electrolysis of water.
3. Step 3. Hydrogen — is material for — Weather balloon. Filled with hydrogen or helium.
4. Step 4. Weather balloon — has part — Radio. A radiosonde.

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