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प्रश्न
How much pressure do we carry on our heads? why don't we feel it?
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उत्तर
We carry atmospheric pressure of about 105 Pa on our heads. We don't feel it because this atmospheric pressure is balanced by the pressure created by the air and blood inside our body.
संबंधित प्रश्न
State the units in which pressure is measured.
Fill in the blank with suitable word :
Force acting on a unit area is called...................
State two factors on which the pressure at a point in a liquid depends.
Describe an experiment to show that the liquid pressure at a point increases with the increase in height of the liquid column above that point.
Describe the crushing tin can experiment. What do you conclude from this experiment?
Viscosity depends on the pressure of a liquid.
Analogy
Liquid pressure: ______ :: Atmospheric Pressure: ______.
A liquid flowing out of a very small opening of a tube or tap comes out in the form of fine drops and not as a continuous stream. Why?
A solid floats in liquid with a portion of it being submerged. Then ______.
- The liquid exerts an upthrust equal to the weight of the solid
- The weight of the dispersed liquid is equal to the weight of solid
- Solid exerts a force equal to its weight on liquid
Assertion (A): The force acting on the surface of a liquid at rest, under gravity, in a container is always horizontal.
Reason (R): The forces acting on a fluid at rest have to be normal to the surface.
