If you’ve ever whacked the bottom of a ketchup bottle to get that tasty tomato goop flowing, you’ve put some serious physics to work. Ketchup is a non-Newtonian fluid. So are toothpaste, yogurt, ...

This article explores viscosity, covering definitions, measurement considerations, viscometer selection, and the symbiotic relationship between viscosity and rheology. The critical elements to ...

A new device helps scientists measure lava viscosity during active flows. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Last year, scientists ...