If the gas you are measuring is between its lower explosive limit (LEL) and upper explosive limit (UEL), the ambient atmosphere is readily what?

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Multiple Choice

If the gas you are measuring is between its lower explosive limit (LEL) and upper explosive limit (UEL), the ambient atmosphere is readily what?

Explanation:
When a gas concentration sits between the lower and upper explosive limits, the air-gas mixture is within the flammable range. That means there is enough fuel and enough oxygen to support ignition and sustained burning if an ignition source is present. In hazmat terms, this atmosphere is readily combustible. Outside that range (below the LEL or above the UEL), the mixture is too lean or too rich to ignite. For reference, many gases have specific LEL and UEL values (for example, methane ignites in air roughly between 5% and 15%), illustrating why the within-range condition is described as combustible.

When a gas concentration sits between the lower and upper explosive limits, the air-gas mixture is within the flammable range. That means there is enough fuel and enough oxygen to support ignition and sustained burning if an ignition source is present. In hazmat terms, this atmosphere is readily combustible. Outside that range (below the LEL or above the UEL), the mixture is too lean or too rich to ignite. For reference, many gases have specific LEL and UEL values (for example, methane ignites in air roughly between 5% and 15%), illustrating why the within-range condition is described as combustible.

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