• Describe what determins the pressure in a liquid
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Learning objectives
8.3 Pressure in liquids
• Explain what is meant by liquid pressure
• Describe what determins the pressure in a liquid
Slide 1 - Diapositive
Liquid pressure
Liquids and gases consist of many small particles in constant random motion. These particles exert forces on any surfaces that they happen to collide with.
Slide 2 - Diapositive
Why the concrete at the bottom of dam is thicker?
Slide 3 - Diapositive
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Slide 5 - Diapositive
Upthrust and liquid pressure
The upthrust acts in the opposite direction to the weight and is caused by the pressure of the liquid acting over the area of the object in the liquid.
Slide 6 - Diapositive
Characteristic of liquid pressure
1. Increases with depth.
2. Acts in all directions.
3. The pressure at the two points at the same level is the same.
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Slide 8 - Diapositive
The bends
If a diver goes deeper and deeper into the water, more nitrogen builds up in the bloodstream and other tissues.
when the diver ascends quickly to the surface, this Nitrogen forms bubbles, as the pressure is reduced, in the bloodstream.
