If a refrigerant sight glass shows bubbles, the most likely interpretation is that there is what in the liquid?

If a refrigerant sight glass shows bubbles, the most likely interpretation is that there is what in the liquid?

• A. Flash Gas Caused by Restriction
• B. Air in the System
• C. Gas in the Liquid
• D. Too Much Refrigerant

Answer: (C)

Bubbles in a refrigerant sight glass indicate that gas is present in the liquid refrigerant. That means the liquid isn’t fully liquid as it passes through the sight glass—there are vapor pockets mixed with the liquid. This commonly happens when the system isn’t fully condensed before the sight glass, often due to low refrigerant charge or conditions that cause partial flashing as the liquid moves through the valve or line. The other ideas describe different situations (air contamination, vapor created specifically by a restriction, or simply too much refrigerant) and don’t align with the direct observation of vapor bubbles within the liquid itself. So, the clear interpretation of those bubbles is that there is gas in the liquid. If you see this consistently, it’s a good sign to check refrigerant charge and the condensation process upstream.

Bubbles in a refrigerant sight glass indicate that gas is present in the liquid refrigerant. That means the liquid isn’t fully liquid as it passes through the sight glass—there are vapor pockets mixed with the liquid. This commonly happens when the system isn’t fully condensed before the sight glass, often due to low refrigerant charge or conditions that cause partial flashing as the liquid moves through the valve or line. The other ideas describe different situations (air contamination, vapor created specifically by a restriction, or simply too much refrigerant) and don’t align with the direct observation of vapor bubbles within the liquid itself. So, the clear interpretation of those bubbles is that there is gas in the liquid. If you see this consistently, it’s a good sign to check refrigerant charge and the condensation process upstream.