
Interpretation:
The option which has only units of pressure needs to be identified.
Concept introduction:
Pressure (P) is the force (F) exerted per units area (A) of a surface i.e.
The units of pressure are derived from the units of force and area.

Answer to Problem 1STP
(A) atm, lb/in2 and in Hg
Explanation of Solution
Based on equation (1):
One of the units of force (F) is pounds (lb)
Area (A) can be expressed in square inches i.e. in2
Hence:
The net pressure experienced at every point on the earth's surface is expressed in terms of atmospheric pressure i.e. in units of 'atm'
Atmospheric pressure is usually measured using mercury (Hg) barometers which contains a Hg column of nearly 30 in height. Hence, the pressure can also be expressed in terms of inches of Hg i.e. 'in Hg'.
Therefore, the units of pressure are: atm, lb/in2 and in Hg.
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