What properties should an ideal refrigerant possess?

An ideal refrigerant should possess properties that enhance its efficiency and safety in refrigeration systems. A low boiling point is essential because it allows the refrigerant to evaporate easily at lower temperatures, facilitating heat absorption from the environment that is being cooled. This property boosts the overall efficiency of the refrigeration cycle, making the process more effective in transferring heat.

Additionally, being non-toxic is crucial for ensuring the safety of individuals who may be exposed to the refrigerant during its use and maintenance. Non-toxic refrigerants present a lesser health hazard, reducing risks in case of any leaks or accidents.

The other options present characteristics that are generally undesirable in refrigerants, such as high boiling points, flammability, toxicity, and high-pressure traits, which can lead to inefficiencies and safety concerns in refrigeration applications. Therefore, the combination of a low boiling point and non-toxic nature distinctly characterizes an ideal refrigerant, making it a suitable choice for modern refrigeration systems.