u/Equivalent_Apple_706

I know this may be a basic question, but I’ve been trying to understand the relationship between gas behavior and Bernoulli’s principle.

From what I understand, gases are usually described by the ideal gas law:

PV = nRT

while Bernoulli’s principle is:

p + 1/2ρv² + ρgh = constant

What confuses me is that Bernoulli’s equation is often introduced for incompressible flow, while gases are compressible by nature. However, noble gases like helium flowing inside a tube or pipe can sometimes experience very little compression depending on the conditions.

So in that situation, is it scientifically correct to say helium can approximately behave under Bernoulli’s framework like an incompressible fluid? If so, why does a gas behave like a fluid in this case?