-1
$\begingroup$

In Bernoulli principle we say that as velocity increases the pressure of fluid decreases but it contradicts kinetic theory of gas which says that as velocity increase-pressure increases. And this seems intuitive also. Please explain

$\endgroup$
0

1 Answer 1

2
$\begingroup$

You are mixing up two different 'kinds' of velocity. The one referenced in the Bernoulli principle is a stream velocity, where a fluid moves more or less uniformly in one direction. The velocity referenced in kinetic theory of gases is the thermal velocity, which is the average velocity of the random thermal movement of the particles.

Take a gas without flow at a temperature T. The Bernoulli velocity will be zero, but the velocity used in kinetic gas theory will not be zero because of the thermal movements of the particles, which are described by the Maxwell-Boltzmann distribution.

$\endgroup$

Not the answer you're looking for? Browse other questions tagged or ask your own question.