In a properly functioning air conditioning system, how should the refrigerant behave as it passes through the compressor?

In a properly functioning air conditioning system, the refrigerant should transition from a liquid state to a gas as it passes through the compressor. This process is essential for the refrigeration cycle to operate effectively. The compressor plays a crucial role in increasing the pressure and temperature of the refrigerant, which is necessary for its transformation into a gas.

As the refrigerant enters the compressor, it is typically in a low-pressure, low-temperature gaseous state after passing through the evaporator. The compressor then compresses this gas, raising both its pressure and temperature, which allows it to travel to the condenser where it can release heat and condense back into a liquid. This cycle of evaporation and condensation is what cools the air circulated by the air conditioning system.

The other choices reflect incorrect behavior of refrigerant in this context. Remaining in a liquid state would prevent the compressor from performing its intended function, while becoming a solid is not characteristic of refrigerants at typical operating temperatures and pressures. Remaining at atmospheric pressure indicates a failure to compress the refrigerant, which is critical for the cycle's efficiency and function.