"LEL" yog hais txog qhov kev txwv qis qis, uas yog cov lus qhia rau cov pa taws kub hnyiab. Qhov qis tshaj plaws ntawm cov pa hluav taws xob hauv huab cua thaum nws ntsib cov nplaim taws qhib yog hu ua qhov kev txwv qis qis - hu ua "LEL". Lus Askiv: Lower Explosive Limit.
Thaum qhov concentration ntawm cov pa taws kub hnyiab hauv huab cua nce mus txog nws qhov kev txwv qis ntawm kev tawg, peb hu ua qhov phom sij tawg ntawm qhov chaw uas muaj hluav taws kub hauv qhov chaw no li 100 feem pua, uas yog, 100 feem pua LEL. Yog tias cov roj combustible tsuas yog nce mus txog 10 feem pua ntawm nws qhov kev txwv qis qis, peb hu rau qhov kev phom sij tawg ntawm qhov chaw combustible nyob rau lub sijhawm no 10 feem pua LEL; Kev saib xyuas cov roj combustible hauv huab cua ambient feem ntau ncaj qha ua rau muaj kev phom sij ntawm ib puag ncig combustible Degree, uas yog, feem pua ntawm cov ntsiab lus ntawm cov roj combustible hauv huab cua thiab nws qhov kev txwv qis dua: [% LEL]; Yog li ntawd, kev soj ntsuam zoo li no qee zaum hu ua "explosion test", thiab cov cuab yeej saib xyuas siv kuj hu ua "explosion tester".
