A general definition of refrigerant is?

A refrigerant is a substance used in cooling systems, such as air conditioners and refrigerators, to absorb and release heat during phase changes between liquid and gas. It circulates through the system, enabling the transfer of heat from inside a space to the outside environment. Refrigerants can vary in chemical composition and properties, impacting their efficiency and environmental impact, particularly concerning ozone depletion and global warming potential.