Bernoulli’s equation, which was named for Daniel Bernoulli, relates the pressure in a gas to the local velocity; so as the velocity changes around the object, the pressure changes as well.

**What’s the problem?**

Bernoulli’s equation is used on aircraft to provide a speedometer called a pitot-static tube. A pressure is quite easy to measure with a mechanical device. In a pitot-static tube, we measure the static and total pressure and can then use Bernoulli’s equation to compute the velocity.

**Ask**– How fast is this airplane going? It is moving through the air at some speed. The air itself can be moving too. Pilots talk about headwinds and

**Do It**

Challenges for you to work on…

- Bernoulli Tubes
- Floating Ball
- Ball And Funnel
- Ball In A Stream Of Water
- Lifting Plate
- Attracting Sheets
- Curve Ball
- Bjerknes’ Tube
- Bernouli Pen Barrel

**Learn more…**

- Bernoulli and Newton – very complex explanation of the usual over-simplification of the description of the forces of aerodynamic lift