Instant coffee and aeroplane: what they have in common

1. Step 1. Instant coffee — uses — Freeze-drying. Freeze-dried coffee.
2. Step 2. Freeze-drying — uses — Vacuum. Ice sublimating in a vacuum.
3. Step 3. Vacuum — is used in — Barometer. The Torricellian vacuum above the mercury.
4. Step 4. Barometer — evolved into — Altimeter. An altimeter is a barometer with an altitude scale.
5. Step 5. Altimeter — is part of — Cockpit. An altimeter.
6. Step 6. Cockpit — is part of — Aeroplane. A cockpit.

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