>> 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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