Which property describes the ability of a compressor to move vapor only?

The property that describes the ability of a compressor to move vapor only is typically referred to in terms of CFM, which stands for Cubic Feet per Minute. This measurement indicates the volume of air (or vapor) that the compressor can move in a specific timeframe, making it a key performance indicator for compressors in refrigeration systems.

Understanding CFM is essential for evaluating the capacity of a compressor in handling vapor as it directly relates to its ability to compress and circulate refrigerant gases in an efficient manner. In industrial ammonia refrigeration systems, for instance, the ability to manage vapor is crucial for achieving the desired cooling effect and maintaining system efficiency.

The other measurements—GPM (Gallons per Minute), MPH (Miles per Hour), and KPH (Kilometers per Hour)—do not pertain to the movement of vapor and relate to different contexts, such as fluid flow rates or speed, which are not relevant to the function of a compressor in this scenario. Focusing on CFM allows for an accurate assessment of a compressor's capability to handle gaseous refrigerants effectively.