Question $4$

$10$ Points

You are investigating an ethylene leak, and you find that the ethylene concentration in the atmosphere is $30\%.$ Is this value lower than the LEL, higher than the UEL, or within the explosive range?

$($A$)$Within the explosive range

$($B$)$Lower than the LEL

$($C$)$ Higher than the UEL

$($D$)$The flammability cannot be determined from the data