Which two metrics describe refrigerants' environmental concerns?

Which two metrics describe refrigerants' environmental concerns?

• A. Color and odor
• B. Thermal conductivity and viscosity
• C. Ozone depletion potential and global warming potential
• D. Melting point and boiling point

Answer: (C)

Environmental impact of refrigerants is evaluated by how they affect both the ozone layer and the climate. Ozone depletion potential measures how much a refrigerant will deplete the stratospheric ozone relative to a reference substance, while global warming potential compares the substance’s heat-trapping effect to CO2 over a defined time horizon. Together, these two metrics capture the main environmental concerns associated with refrigerants. The other properties listed aren’t about environmental impact. Color and odor are sensory characteristics, not indicators of environmental harm. Thermal conductivity and viscosity affect heat transfer performance, not environmental effects. Melting point and boiling point describe phase behavior and operating conditions, not environmental risk.

Environmental impact of refrigerants is evaluated by how they affect both the ozone layer and the climate. Ozone depletion potential measures how much a refrigerant will deplete the stratospheric ozone relative to a reference substance, while global warming potential compares the substance’s heat-trapping effect to CO2 over a defined time horizon. Together, these two metrics capture the main environmental concerns associated with refrigerants.

The other properties listed aren’t about environmental impact. Color and odor are sensory characteristics, not indicators of environmental harm. Thermal conductivity and viscosity affect heat transfer performance, not environmental effects. Melting point and boiling point describe phase behavior and operating conditions, not environmental risk.