The aim of carburization is to increase the carbon concentration in the surface layer of a steel to improve its wear resistance. If it takes 40 min to reach the desired carbon concentration at a depth of 1 mm, the time required to achieve the same carbon concentration at the increased depth of 1.5 mm is

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.

it would only be the stuff in module eight so you need to study all the lessons in that you also could check the flvs

hope this : )