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iabatic, then pressure and density have to change in the same
direction - so it's kind of chicken and egg. On the microsopic level,
why does the density lower? Mass continuity requires rho*A*v to be
constant in equilibrium flow, so small A will require higher v - but
why a rho change? - it's not needed with a liquid obviously - so why
with gas molecules with lots of space between them?
If the gas molecules speed up, they must have suffered more
collisions from the direction of the wider pipe and fewer from the
direction of the narrower pipe - so we're back around the circle
again.