- We’re going to build a pressure divider. This is done with two bellows, which show the pressure at different points in the circuit. Bellows show pressure by how much they expand.
- Build the breadboard setup. Use the 0.5mm resistors.
- Turn on the pump and observe the two bellows. Which one expands more? Why?


Note: In this circuit you built with the bellows, the top bellow feels all the pressure from the pump, but the bottom bellow feels only half the pressure because it is in between two equal (black) resistors.
Basically you are dividing the pressure with the two resistors. This type of setup is called a pressure divider.