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Reyn

physical science Maturity 11-13 Next article →

How thick is a liquid? Scientists use a unit called the reyn to find out. This unit measures dynamic viscosity. Viscosity is a way to describe how a liquid flows. A thick liquid flows slowly. A thin liquid flows fast.

The reyn is a British unit. It is named after a man named Osbourne Reynolds. He is also known for the Reynolds number.

There are many ways to measure thickness. One way uses a unit called the poise. One reyn is about 68,947.6 poise.

Scientists also use SI units. These are units used in many parts of the world. One reyn equals about 6,894.76 pascal-seconds. A pascal-second is another way to measure viscosity. You can also use newton-seconds per square meter.

By definition, one reyn is 1 pound-force second per square inch. This is written as 1 lbf s in⁻². This helps people study how fluids move in science.

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