________ is the pressure exerted by air on an object.
Atmospheric pressure is the pressure exerted by air on an object.
Atmospheric pressure is the pressure exerted by the weight of air present in the atmosphere.
It is commonly measured with a barometer, in which a column of mercury in a glass tube rises or falls as the weight of the atmosphere changes.
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- A rectangular wooden block has length, breadth and height of 50 cm, 25 cm and 10 cm, respectively. This wooden block is kept on ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground?(a) the maximum pressure is exerted when the length and breadth form the base(b) the maximum pressure is exerted when length and height form the base(c) the maximum pressure is exerted when breadth and height form the base(d) the minimum pressure is exerted when length and height form the base.
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- State whether the following statements are true or false:(a) The pressure exerted by a liquid depends on the area of base of its container.(b) A drinking straw works on the pressure exerted by the liquid filled in a soft drink bottle in which it is placed.
- What is the special name of frictional force exerted by fluids (like air or water)?
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- (a) Define pressure.(b) What is the relation between pressure, force and area ? ,(c) Calculate the pressure when a force of $200\ N$ is exerted on an area of:(i) $10\ m^2$(ii) $5\ m^2$
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- The mountaineers carry oxygen with them because:(a) At an altitude of more than 5 km there is no air.(b) The amount of air available to a person is less than that available on the ground.(c) The temperature of air is higher than that on the ground.(d) the pressure of air is higher than that on the ground.
- Which exerts more pressure- air or water?
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