What is the LFL of ethane at ambient temperature in air?

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Multiple Choice

What is the LFL of ethane at ambient temperature in air?

Explanation:
The key idea is what the Lower Flammable Limit (LFL) means: it’s the smallest fraction of ethane that, when mixed with air, can ignite if an ignition source is present. Below that concentration, the mixture is too lean to burn. For ethane in air at ambient temperature, the flammable range is about 2.0% to 12.5% by volume. That makes 2.0% the LFL, since it’s the lower end of the range. The 12.5% value is the Upper Flammable Limit (UFL), not the LFL. The other options don’t line up with the established endpoints of the flammable range.

The key idea is what the Lower Flammable Limit (LFL) means: it’s the smallest fraction of ethane that, when mixed with air, can ignite if an ignition source is present. Below that concentration, the mixture is too lean to burn.

For ethane in air at ambient temperature, the flammable range is about 2.0% to 12.5% by volume. That makes 2.0% the LFL, since it’s the lower end of the range. The 12.5% value is the Upper Flammable Limit (UFL), not the LFL. The other options don’t line up with the established endpoints of the flammable range.

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