Certified Apartment Maintenance Technician (CAMT) 2025 – 400 Free Practice Questions to Pass the Exam

Using soapy bubbles is an effective method for confirming refrigerant leaks, especially when an electronic leak detector has indicated a potential issue. When a refrigerant leak occurs, it often escapes under pressure and can create tiny bubbles in surrounding air. Applying a mixture of soap and water at the suspected leak site provides a visual indication of escaping gas; if bubbles form and grow, it confirms that a leak exists.

This method is advantageous because it is simple, cost-effective, and highly visual. As the soap solution clings to surfaces, any escaping refrigerant will create bubbles that can be observed easily. This makes it a practical tool in the maintenance technician's toolkit for leak detection.

In contrast, while the other substances have their specific uses in a maintenance context, they are less effective or applicable for confirming refrigerant leaks. Oil may be present in some cooling systems but does not provide a visual confirmation of leaks. Alcohol may help clean surfaces but lacks the properties needed to visibly illustrate a leak. Dry ice, while potentially useful for other purposes such as cooling, does not assist in the detection of refrigerant leaks.