# Archimedes principle and relativity

zarei
Is there any relativistic version for Archimedes principle?

Gold Member
I suppose such might exist if you want to get really weird about it, but relativistic effects have essentially no bearing upon any kind of Earth-bound fluid action. How often does something at a speed approaching c fall into a bathtub?

zarei
Suppose instesd of mass we use energy and our fliud be a relativistic perfect fluid.

Gold Member
Suppose instesd of mass we use energy and our fliud be a relativistic perfect fluid.

That sort of negates the original question, since such can't exist. I'm getting out of my depth here, so I'm going to wait for someone with a better education to respond.

blackwing1
Suppose instesd of mass we use energy and our fliud be a relativistic perfect fluid.

wouldn' t is kinda be hard for the energy to displace the water? then again, I'm not einstein so i dunno.

gravity = archimedes principle.

the fabric of spacetime replaces the water in this pple. in the universe there is no up or down, therefore the buyoyancy pressure takes place everywhere around matter until matter becomes spherical.

One needs an analog of Archimedes' Principle to discuss hydrostatic equilibrium in the interior of a neutron star.