Gas leak

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In common usage, a gas leak refers to a leak of natural gas, from a pipe or other containment, into a living area. As natural gas explodes when exposed to flame or sparks, this situation is rather dangerous.

Safety

Although natural gas is by nature colorless and odorless, scents are usually added, to assist in identifying leaks. This odor commonly takes the form of rotting eggs. If this scent is detected, it is recommended to evacuate the area immediately, usually to the outside. Do not light fires/cigarettes, and do not operate electrical appliances/light switches/phones, as these may act as points of ignition. Once in a safe area, contact your natural gas provider.

Other contexts

If working with other dangerous gasses (such as in a lab or industrial setting), a gas leak can refer to a leak of some other gas. The identity of the gas in question is usually obvious from context, and requires the same response: evacuate, and seek help from someone equipped to deal with that particular gas. Other details depend on the gas in question.