Final answer:
HFO refrigerants are less flammable than HC refrigerants due to their chemical composition. The presence of fluorine in HFO refrigerants makes them more stable and less likely to ignite compared to HC refrigerants. Pressure and temperature variations also influence the flammability of refrigerants.
Step-by-step explanation:
HFO refrigerants are less flammable than HC refrigerants primarily due to their chemical composition. HFO stands for Hydrofluoroolefin, which is a type of refrigerant that contains carbon, hydrogen, and fluorine atoms. On the other hand, HC stands for Hydrocarbon, which is a refrigerant made up of only carbon and hydrogen atoms.
The presence of fluorine in HFO refrigerants makes them more stable and less likely to ignite compared to HC refrigerants. It's important to note that both pressure and temperature variations can influence the flammability of refrigerants. However the primary factor that differentiates the flammability of HFO and HC refrigerants is their chemical composition.