Never heard it called "hydraulics", but yeah - Conservation of mass implies a higher flow-rate as channel-width decreases, while fluid incompressibility and conservation of momentum imply a drop in pressure. Together they're known as "the Venturi effect" after Giovanni Venturi, who first observed the effect in the late 1700s.
In modern terms, the Venturi effect is often described as a consequence of "Bernoulli's theorem", which is a special case of Euler's equations, which are the Navier-Stokes equations without viscosity.
This is why I dropped physics but Bernoulli is why planes fly is all I faintly remember
I did not think that would be in common with liquid as air is very compressible
Ex girlfriend use to do that, she'd have a few pairs she wore but the rest would just be kept in boxes in the cupboard(s), she'd always get them for Christmas and birthdays from family but never actually wear them. Clearly when I realised this I knew she was never going to be moving in with me..
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