A water manometer is used to measure the pressure of a gas supply to a house. It gives a reading of h cm of water.
Why is it better to use water rather than mercury in this manometer?
1 )
h would be too large if mercury were used.
h would be too small if mercury were used.
3 )
The tube would need to be narrower if mercury were used.
4 )
The tube would need to be wider if mercury were used.
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