A century after Albert Einstein said we would never be able to observe the instantaneous velocity of tiny particles as they randomly shake and shimmy (in so-called Brownian motion), physicist Mark ...

When a fluid is in motion, it must move in such a way that mass is conserved. To see how mass conservation places restrictions on the velocity field, consider the steady flow of fluid through a duct ...

University of Florida provides funding as a founding partner of The Conversation US. How short is an “instant”? Is it a second? A tenth of a second? A microsecond? You might think all of these qualify ...