It is the breakdown of oil due to moisture.

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Multiple Choice

It is the breakdown of oil due to moisture.

Explanation:
Moisture in refrigerant oil causes hydrolytic breakdown, where water reacts with the oil (especially when hot) to form acidic compounds and sludge. This degrades lubrication and can harm the compressor. The statement that describes oil breaking down due to moisture matches this exact process, making it the correct choice. The other ideas describe different phenomena—breakdown from heat is thermal degradation, dissolution of refrigerant in oil is a solubility issue, and polymerization is the formation of larger molecules—none of which capture moisture-driven degradation.

Moisture in refrigerant oil causes hydrolytic breakdown, where water reacts with the oil (especially when hot) to form acidic compounds and sludge. This degrades lubrication and can harm the compressor. The statement that describes oil breaking down due to moisture matches this exact process, making it the correct choice. The other ideas describe different phenomena—breakdown from heat is thermal degradation, dissolution of refrigerant in oil is a solubility issue, and polymerization is the formation of larger molecules—none of which capture moisture-driven degradation.

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