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Holes in Soda Bottle: Qualitative Observational Experiment
Aim
The aim of this experiment is to discover how the pressure in a fluid varies with depth. The observations will only allow for a qualitative pattern.
Prior Knowledge
- Kinematics.
- Newton's Laws.
- Impulse and momentum?
- Physical quantity of pressure.
Description of the Experiment
Three equal size holes are punched at different heights into the side of a two-litre soda bottle.
Observe the jets of a liquid emerging from the three holes. Note how far they go.
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Questions
- What is the purpose of keeping the top of the bottle open?
- Can you rank the initial velocities of the jets from smallest to largest?
- Why would the jets come from the holes? Why does the one from the bottom hole go farther?
- Considering that the holes all have the same size, can you come up with a qualitative pattern how the pressure in the liquid varies with depth?
