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A Lower Explosive Limit (LEL) meter is a device used to measure the concentration of a flammable gas or vapor in the air, expressed as a percentage of the gas' lower flammable limit. It's commonly used in industrial settings to monitor potentially hazardous atmospheres and alert workers to the presence of explosive conditions.

The lower flammable limit of natural gas is around 5% by volume in air, meaning that concentrations below this level are too lean to ignite. The upper flammable limit is approximately 15% by volume, beyond which the mixture is too rich to ignite.

Hazardous gas refers to any gas that poses a threat to health, safety, or the environment. Flammable gas specifically refers to a gas that can ignite and burn in the presence of oxygen. All flammable gases are considered hazardous, but not all hazardous gases are flammable.

For a gas or vapor to be flammable or pose an explosion hazard, it needs to be present in a concentration within its flammable range, be in contact with an ignition source, and have sufficient oxygen available for combustion. The presence of flammable material, oxygen, and an ignition source creates the conditions for a fire or explosion to occur.