Which of the following quenching materials is LEAST severe in its quenching action (slowest cooling) ? a. Air b. Brine c. Oil d. Water

(a) air

Explanation:

in the following given quenching materials air is the least serve quenching action quenching is a process of heating the material and then rapidly cooling it. Quenching freezes the structure of the material including stresses. Oil has the most sever in its quenching action the commonly used used oil for quenching process is peanut and canola oil