Online Experiment: Fluid Pressure and Flow

Bernoulli discovered that a part of the pressure energy is converted into kinetic energy.

When velocity increases it therefore results in a drop in pressure, so that the lowest pressure occurs in the narrowest cross-section. Bernoulli’s equation states that the energy of a frictionlessly flowing, incompressible fluid is constant.

With the help of this program you can see for yourself how a Bernoulli experiment works.


Explore pressure in the atmosphere and underwater. Reshape a pipe to see how it changes fluid flow speed. Experiment with a leaky water tower to see how the height and water level determine the water trajectory.

Sample Learning Goals

  • Investigate how pressure changes in air and water.

  • Discover how you can change pressure.

  • Predict pressure in a variety of situations.

  • Determine how fluid motion affects the pressure.

  • Figure out how to convert water pressure to water velocity.

PhET Interactive Simulations / University of Colorado Boulder /