Appendix
13-1. Definition of terms
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13
Appendix
13-1. Definition of terms
vol%
Gas concentration indicated in the unit of one-hundredth of the volume
ppm
Gas concentration indicated in the unit of one-millionth of the volume
LEL
The acronym of Lower Explosive Limit.
Lower explosive limit (LEL) refers to the lowest concentration of a combustible gas
in air capable of causing explosion when ignited.
13.