When were CFCs primarily developed for use as refrigerants?

• A. Since the early 1900s
• B. Since the late 1920s
• C. Since the 1960s
• D. Since the early 2000s

Answer: (B)

CFCs, or chlorofluorocarbons, were primarily developed for use as refrigerants in the late 1920s. This innovation came about as scientists and engineers were seeking a safer and more efficient alternative to the hazardous refrigerants that were used at the time, such as ammonia and sulfur dioxide. CFCs became popular due to their stability, non-flammability, and low toxicity, which made them ideal for use in household and commercial refrigeration systems.

Understanding the timeline of CFC development is crucial, as their use significantly shaped the refrigeration and air conditioning industries throughout much of the 20th century. However, their widespread use later raised environmental concerns due to their role in ozone layer depletion, leading to international regulations such as the Montreal Protocol aimed at phasing them out.