What is the density of vapor for R717 at a specified temperature?

The density of vapor for R717, also known as ammonia, at a specified temperature is a crucial parameter in refrigeration applications. The correct density value is 0.0255 lbs./ft³. This value is significant because it helps engineers and operators calculate the mass flow rates of ammonia in refrigeration systems, determine appropriate equipment sizing, and understand the behavior of the vapor in different operating conditions.

Understanding vapor density is essential for ensuring efficient operation and correct design of refrigeration cycles. In industrial refrigeration, ammonia is often used due to its favorable thermodynamic properties, and knowing its vapor density aids in optimizing system performance, calculating heat transfer, and performing safety assessments.

The other choices provided are either slightly higher or lower than the established density of vapor for R717, which aligns with the specific temperature conditions referenced in the question. These variations under different conditions – such as temperature and pressure – render them inaccurate for the stated context.