Is pitch a liquid or a solid? It turns out that while it appears to be a solid at room temperature, it actually flows like a liquid ... a very, very viscous liquid. Why is this interesting? One of the ...

Experiments using heavy crude oil samples from PetroChina's Shengli oil field show ultrasonic irradiation can reduce viscosity by up to 85%, enhancing oil recovery. Increasing production from the ...

What if a material that looks solid could actually flow… over nearly a century? Launched in 1927 by an Australian professor to illustrate viscosity, an experiment of disarming simplicity has become a ...