Hydraulic machines are part of our everyday lives. When you step on the brakes in your car, brake fluid, which cannot be compressed, is forced from a cylinder into the braking mechanism attached to your wheels. Hydraulic mechanisms work because fluid cannot expand, but it will easily flow to areas where there is less pressure.

Ref: Tributsch, Helmut. 1983. "How spiders stretch." Science Digest, Oct. p. 74. Photo: Spider by Marjon Besteman – Pixabay.com

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