Water Pressure Experiment
This experiment is good to demonstrate water pressure.
Things you’ll need: a water bottle with water, modeling clay, two straws, and scissors.
- Use the scissors to cut one straw to be shorter than the other.
- Use the modeling clay to hold the straws together as shown in the picture.
- Place the straw and the modeling clay on the bottle as shown in the picture. (Warning: don’t let one of the straws touch the water and don’t let any air come out from the bottle). Seal the clay tightly and close all the holes.
- Blow the straw that didn’t touch the water and the water will come out from the other straw.
Click on image to get bigger
Water pressure is a measure of the force that gets the water through our mains and into your pipes. It is measured in ‘bars’ – one bar is the force needed to raise water to a height of 10 meters. 0.1 bar equivalent to approximately 1.45 pa of pressure. With low-pressure water systems, you’ll want to measure your water pressure precisely to find a tap or shower that will give you optimum flow.
 The red arrows are water pressure.
Danupon Drake 