What is the atmospheric pressure in metric units?

• A. 1 atm (n/m^2)
• B. 14.7 psi
• C. 1000 kg/m^3
• D. 62.4 lb/ft^3

Answer: (A)

Atmospheric pressure in metric units is commonly expressed as 1 atmosphere, which is equivalent to 101,325 pascals (Pa) or 101.325 kilopascals (kPa). In terms of force per unit area, it can also be expressed as 1 atm (n/m^2), where "n" stands for newtons. Since 1 Pascal is defined as 1 newton per square meter, stating atmospheric pressure as 1 atm (n/m^2) is an accurate and appropriate metric representation.

The other choices reference units that are not standard metric units for atmospheric pressure. For example, psi (pounds per square inch) is a unit used in the imperial system. Similarly, density measures such as 1000 kg/m^3 and 62.4 lb/ft^3 are relevant in different contexts (e.g., specific gravity or material density) but do not describe atmospheric pressure. Therefore, the answer correctly identifies the metric expression of atmospheric pressure.