Hydraulics & Fluid Mechanics
Mercury is often used in barometer because

the height of barometer will be less
its vapour pressure is so low that it may be neglected
it is the best liquid
both (B) and (C)

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Hydraulics & Fluid Mechanics
According to Bernoulli’s equation for steady ideal fluid flow

total energy is constant throughout
principle of conservation of mass holds
velocity and pressure are inversely proportional
the energy is constant along a stream-line but may vary across streamlines

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