Cartesian coordinates and hydraulic press: what they have in common

1. Step 1. Cartesian coordinates — uses — Euclidean geometry. Analytic geometry.
2. Step 2. Euclidean geometry — is used in — Weather station. Instruments are set up on a site according to a standard.
3. Step 3. Weather station — has part — Barometer. A barometer.
4. Step 4. Barometer — works like — Manometer. Both measure pressure with a column of liquid: a barometer measures the air around us, a manometer the pressure inside a vessel.
5. Step 5. Manometer — uses — Hydraulics (Pascal’s law). A liquid manometer is a pair of communicating vessels: the difference in levels shows the pressure.
6. Step 6. Hydraulics (Pascal’s law) — is used in — Hydraulic press. Pascal’s law multiplies the force.

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