The number of gas molecules striking per second per square metre of the top surface of a table placed in a room at $20^{\circ} C$ and 1 atmospheric pressure is of the order of $\left(k_{B}=1.4 \times 10^{-23} \,JK ^{-1}\right.$ and the average mass of an air molecule is $5 \times 10^{-27} \,kg$ )
KVPY 2017, Diffcult
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