At what degree is the density of liquid 54.12 lbs./ft3?

The correct choice of 37 degrees Fahrenheit corresponds to a specific temperature at which the density of a refrigerant, typically ammonia, reaches 54.12 lbs/ft³. Understanding the relationship between temperature and density is crucial in industrial refrigeration operations. As a fluid's temperature changes, its density will also vary due to changes in molecular motion and spacing.

In this question, the precise temperature is essential for calculating the system’s efficiency and performance. Knowing the density of a refrigerant at a given temperature allows operators to make informed decisions about system design, efficiency assessments, and the safe operation of refrigeration equipment.

When examining density values for refrigerants, data tables are commonly used, which display density at various temperatures. The choice of 37 degrees aligns with density values typically observed in standard refrigeration data tables, indicating that at this temperature, the refrigerant in question maintains the specified density of 54.12 lbs/ft³. Consequently, this data is critical for any calculations involving mass flow rates, refrigerant charge calculations, and overall system performance analysis that rely on accurate density readings.