What is the specific weight of water in imperial units?

• A. 9.8 n/m^3
• B. 32.2 lb/ft^3
• C. 62.4 lb/ft^3
• D. 1 atm

Answer: (C)

The specific weight of water in imperial units is defined as the weight of water per unit volume. In the imperial system, this is commonly expressed in pounds per cubic foot (lb/ft³). The correct value for the specific weight of water at standard temperature (approximately 4°C or 39°F) is 62.4 lb/ft^3. This value reflects the typical density of water, which is about 62.4 pounds for one cubic foot of water.

Understanding this value is crucial in various engineering applications, such as fluid mechanics, where calculations often require the specific weight of water for determining buoyancy, hydrostatic pressure, and other related phenomena. This specific weight can vary slightly with temperature and impurities, but 62.4 lb/ft³ is the widely accepted standard for freshwater at the conditions mentioned.

The other answers represent either incorrect values for the specific weight of water or measurements unrelated to this concept. For example, 9.8 n/m³ relates to the specific weight of water in metric units (Newton per cubic meter), while 32.2 lb/ft³ does not correspond to water, rather representing the weight of air. Lastly, 1 atm refers to atmospheric pressure, which is unrelated to specific weight