What is the unit measurement of specific volume as found on a pressure empathy chart?

Specific volume is defined as the volume occupied by a unit mass of a substance, typically expressed in cubic meters per kilogram (m³/kg). It indicates how much space a certain mass of a gas will take up. This measurement is critical in understanding the behavior of gases under different pressure and temperature conditions, particularly in refrigeration and air conditioning contexts.

On a pressure-enthalpy chart, knowing the specific volume helps technicians determine the state and capacity of refrigerants throughout their cycle, aiding in system design and troubleshooting. The other units provided do not accurately represent specific volume; they either denote different physical properties or use an incorrect relationship of volume to mass. Hence, the correct option is m³/kg, as it directly relates volume to mass, which is the essence of specific volume.