Hygrometer and aerosol can: what they have in common

1. Step 1. Hygrometer — is part of — Weather station. A hygrometer.
2. Step 2. Weather station — has part — Thermometer. A thermometer.
3. Step 3. Thermometer — uses — Thermal expansion. A liquid expands when heated.
4. Step 4. Thermal expansion — is used in — Sprinkler. The bulb bursts as the liquid expands.
5. Step 5. Sprinkler — has part — Valve. A glass-bulb valve.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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