Difference between upthrust and atmospheric pressure
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(i) upthrust
● when an object is immersed in liquid it experiences an upward force due to the liquid due to which it loses weight. this upward force is called buoyant force. buoyant force is also known as upthrust
● Eg: when piece of crock is held below the surface of water and then released the crock immediately Rises to the surface. it means some upward force is exerted by the water on the crock which pushes it to the surface
(ii) atmospheric pressure
● the pressure at any place due to atmosphere is called atmospheric pressure. its value varies from place to place. the value of atmospheric pressure at the Earth surface near the sea level is approximately 1.01 into 10 power 5 pa which is also known as 1 atmospheric pressure(ATM). ATM is the unit of pressure 1 ATM is equals to pressure exerted by a Mercury column of length 760 mm=760 mm of Hg
● atmospheric pressure is used in many of the think that we do for example when we drink with a straw while sucking our lungs expand and air is in drinking straw goes into them the air pressure in the straw goes into them the air pressure in the straw decrease and at the atmospheric pressure acting on the surface of water then forces the water to move up inside the straw and into our mouth in the same way
● Pascal's or one bar = 10⁵ Nm`² .