>> it's also useful that 1 bar ~= 10 metres of water for quick estimations.
>
> I didn't quite understand that.
It's useful for quick estimations involving water (one of the most common
pressurised fluids you come across) because it's a multiple of 10.
eg a water tank 4 metres above the tap, pressure at the tap is 0.4 bar.
or, 2 bar coming into your house, what's the pressure at the valve in your
roof 6 metres up? 1.4 bar
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