If liquid is not compressible, why do we need special hydraulic fluid? Why not just use water?

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If liquid is not compressible, why do we need special hydraulic fluid? Why not just use water?

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1. Water freezes at 0°C. It stops being a liquid, which is very bad for hydraulics. 0°C isn’t exactly an extreme temperature you’ll never encounter.

2. Liquids are compressible, just much less than a gas. Hydraulic fluid does so less.

3. Water is actually pretty corrosive compared to many other liquids.

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