What is viscosity? How to measure viscosity?

Viscosity is how thick or slippery a liquid feels when you move through it, like syrup versus water.

Imagine you're trying to pour your breakfast cereal into a bowl. If you use honey, it moves slowly and sticks to the spoon, that's high viscosity. But if you use milk, it flows easily, that's low viscosity.

One fun way to measure viscosity is like watching how fast a syrup slides down a slide, or how quickly a marble rolls through it.

Scientists sometimes use something called a viscometer, which works like a special slide for liquids. You pour the liquid into the viscometer, and watch how long it takes to go from one mark to another. The slower it moves, the more viscous, or "thick", the liquid is.

You can also think of it like playing with Play-Doh versus water. Play-Doh is sticky and slow-moving, high viscosity. Water slips right through your fingers, low viscosity. Viscosity is how thick or slippery a liquid feels when you move through it, like syrup versus water.

Imagine you're trying to pour your breakfast cereal into a bowl. If you use honey, it moves slowly and sticks to the spoon, that's high viscosity. But if you use milk, it flows easily, that's low viscosity.