Sound wave and centrifugal pump: what they have in common

1. Step 1. Sound wave — is used in — Stethoscope. It transmits sound.
2. Step 2. Stethoscope — is used in — Blood pressure monitor. Listening for the Korotkov sounds.
3. Step 3. Blood pressure monitor — evolved from — Manometer. A blood pressure monitor is a manometer connected to a cuff: it measures the air pressure that squeezes the artery.
4. Step 4. Manometer — is part of — Boiler. The gauge on a boiler shows the steam pressure — without it the boiler could explode.
5. Step 5. Boiler — is part of — Central heating. A boiler.
6. Step 6. Central heating — has part — Centrifugal pump. A circulation pump.

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