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Question
Pressure is determined as force per unit area of the surface. The SI unit of pressure, Pascal is as shown below:-
1Pa = 1N m–2
If mass of air at sea level is 1034 g cm–2, calculate the pressure in Pascal.
Solution
Pressure is defined as force acting per unit area of the surface.
`"P" = "F"/"A"`
=`(1034 "g" xx 9.8 "ms"^-2)/("cm"^2)xx(1 "kg")/(1000 "g") xx ((100)^2"cm"^2)/(1 "m"^2)`
= 1.01332 × 105 kg m–1s–2
We know,
1 N = 1 kg ms–2
Then,
1 Pa = 1 Nm–2 = 1 kg m–2s–2
1 Pa = 1 kg m–1s–2
∴ Pressure = 1.01332 × 105 Pa.
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