**Symbol**: P / **Base data**: viscosity.

It is the viscosity of a fluid in which a tangential force of 1 dyne per square centimeter maintains a difference in velocity of 1 centimeter per second between two parallel planes 1 centimeter apart.

**Measured by the force applied by a flow on an inside wall **

Supposing that a sticky substance is flowing inside a pipe. If the flow approaches 1cm of the inside wall, it will slow down by 1 centimeter per second. When a force of 1 dyne (one hundred-thousandth of 1 newton) per square centimeter is generated in the direction of the flow, the viscosity at that time will be 1 poise.

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