What is a common method of leak detection in gas systems?

The use of a soapy water solution is a widely accepted and effective method of leak detection in gas systems. This technique involves applying the soapy water to the areas where leaks may be suspected, such as joints, connections, and valves. If there is a gas leak, the escaping gas will create bubbles in the soapy mixture, making it easy to visually identify the location of the leak. This method is both simple and cost-effective, requiring minimal equipment while providing immediate feedback on the presence of a gas leak.

The other methods listed, while useful in different contexts, are not as commonly applied for leak detection in gas systems. Electromagnetic detectors can sense gas leakage through variations in electromagnetic fields but are typically used in more specialized applications. Heated sensors may require specific conditions to function correctly and are not standard for general leak detection in household or commercial gas lines. Smoke detectors are designed for smoke from fires rather than detecting gas leaks, making them unsuitable for this purpose.