# Coriolis Mass Flow

### Why Measure Mass?

Volume can change significantly under different conditions. Mass is consistent, regardless of temperature or pressure. Mass flowmeters give a clear, uncompromised account of every transaction – any place, any time.

Volume varies with temperature. Mass is a primary measurement and remains the same.

### What is the Coriolis Principle?

The mathematician Gustave De Coriolis first described the Coriolis Effect, which is an inertial force experienced by a moving body (or, in our application, a liquid) in a rotating coordinate system. A familiar example of this effect is the difference in the behavior of a garden hose with and without water flowing through it. In the following demonstration, a length of hose is suspended so that it forms a loop, and made to swing back and forth. When the water is turned off and there is no flow through the hose, the loop swings evenly:

Observe the difference when water is flowing through the hose:

Go to next section: How Does a Mass Flowmeter Work?