Pressure in liquid is due to the weight of the liquid acting on the surface of any objects in the liquid.
P = Pressure h = depth ρ = density of liquid g = Gravitational Field Strength
Figure above shows a fish in a lake. Find the pressure of water exerted on the fish. (Density of water = 1000kg/m3)
Answer:
Pressure caused by water, P = hρg P = (3-1.8)(1000)(10)=12000Pa
P = Pressure Patm = Atmospheric Pressure h = Depth ρ = Density of liquid g = Gravitational Field Strength
The pressure in a liquid increases with depth.
The pressure at any point of a liquid acts equally in all direction.
For a given liquid, the pressure at a point within it varies only with the vertical depth of the point below the surface of the liquid.
Pressure in liquid does not depends on - the shape of the container. - the size of the container. - the area of its surface
Pressure in liquid depends only on its vertical distance from the surface of the liquid.
Pressure at A = Pressure at B
The wall of the dam is built thicker at the bottom to withstand a higher pressure.
The generator is placed at the lower part so that the pressure of the water is high enough to drive the turbine.
The water tower is built at high place so that the water has sufficient pressure to flow to consumer’s house.
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