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Q.

Atmospheric pressure at the sea level is equal to


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a

1.013×105 N/m2

b

1.013 N/m2

c

1.013×10-5 N/m2

d

1.013×106 N/m2 

answer is A.

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Detailed Solution

At sea level, atmospheric pressure is equal to 1.013×105 N/m2 or 1 atm.
Sea level is taken as a benchmark for the measurement of altitude. As we go upwards, e.g., mountains or hills, atmospheric pressure starts to decrease. In other words, atmospheric pressure depends on the altitude. So to use the atm pressure as a unit, we need a constant value for it. And that value we can find at sea level.
 
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