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    Mechanical Properties of Fluids
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    What is a barometer?
    Barometer is a device used to measure the atmospheric pressure. Barometer keeps a track of the change in the atmospheric pressure. 
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    If we exhaust the air from a sealed tin can, what will happen to it?
    If the air from the sealed tin can is exhausted, the tin can will squeeze due to inward force exerted by atmospheric pressure.
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    Barometer tube of mercury barometer is one meter long. Would you require a longer or a shorter tube if the mercury were replaced by water in the tube?

    If the mercury in the barometer tube is replaced with water, we need a longer barometric tube. Water is less denser tan mercury and so we need longer tube. 
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    State Archimedes’s principle.
    Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces. 

    The law is fundamental to fluid mechanics. 
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    An air bubble is released from the bottom of tank. What happens to the size of air bubble as it rises upward in the tank?
    When an air bubble is released from the bottom of the tank, as the bubble rises up, the pressure inside the bubble decreases and hence the size of bubble expands.
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