Final answer:
HCFC-123 is a high pressure refrigerant commonly used in industrial refrigeration systems.
Step-by-step explanation:
HCFC-123 is a high pressure refrigerant. HCFC stands for hydrochlorofluorocarbon, and it is a type of compound that contains carbon, hydrogen, chlorine, and fluorine. In refrigeration systems, HCFCs are used as refrigerants to transfer heat and cool the surrounding environment. HCFC-123 is commonly used in industrial refrigeration systems, and it operates at high pressures to achieve the desired cooling effect.