What should be used to detect a natural gas leak?

Using soapy water or a gas detector is the best method for detecting a natural gas leak. When soapy water is applied to joints and fittings where gas may be escaping, it will create bubbles at the site of the leak. This visual indication helps in easily identifying the leak without the risks associated with using a flame or electrical sparks.

Gas detectors, which are specifically designed to sense the presence of natural gas, provide an electronic method for leak detection. They can alert users through sounds or lights when gas is detected, making them a reliable tool for both residential and commercial settings.

In contrast, the other options are not suitable for leak detection. A hair dryer could potentially ignite gas if a leak is present and is therefore extremely dangerous. Carbon monoxide sensors are designed to detect carbon monoxide, a different gas, and not natural gas. Similarly, smoke detectors serve to detect smoke from fires and do not have the capability to sense natural gas. Therefore, the use of soapy water or a gas detector is the safest and most effective option for identifying natural gas leaks.