Fishing net and boyle’s air pump: what they have in common

1. Step 1. Fishing net — is made of — Plant fibre. Nets were knotted from plant fibres.
2. Step 2. Plant fibre — is material for — Hygrometer. Humidity was shown by a fibre that changed length.
3. Step 3. Hygrometer — is part of — Weather station. A hygrometer.
4. Step 4. Weather station — has part — Barometer. A barometer.
5. Step 5. Barometer — uses — Vacuum. The Torricellian vacuum above the mercury.
6. Step 6. Vacuum — is used in — Boyle’s air pump. The pump draws out the air.

Open Evothings