Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

In order to prove the Bernoulli’s principle ($\frac{p}{\rho} + \frac{1}{2}u^2+\phi = constant$ ), I have to use the Euler equation: $\frac{Du}{Dt} = -\frac{1}{\rho}\nabla p + g$.

I know how to prove it, but I didn't understand what does it mean and say (Euler equation)?

please explain me.

any help appreciated!

share|cite|improve this question
It is not really clear to me what you want to know? Can you maybe clarify a bit? – Bernhard Mar 6 '13 at 21:02
Have you looked at – joshphysics Mar 6 '13 at 21:03
thank you both.. sorry for my english.. I give an example: Pythagorean theorem (a^2+b^2=c^2) means that in a right triangle, a^2+b^2=c^2 where: c represents the length of the hypotenuse, and a and b represent the lengths of the other two sides. thank you both! – Alon Shmiel Mar 6 '13 at 21:43
up vote -1 down vote accepted

Euler equation is the special case of the Navier-Stokes equation that describes fluid motion. Euler equation stands for inviscid flow, i.e. flow with zero viscosity.

To get it a bit more explicit please visit wikipedia page, and for further reference I would suggest you to search for some lecture notes online and select those you would like the most. This is quite popular topic, so there should not be any problem. As a suggestion you may want to have a look here.

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

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