$5.$ Describe the primary application of flash distillation and its operational principle.

$6.$ What role does steam play in a steam distillation process, and for what types of compounds is it particularly useful?

$7.$ How does the McCabe$$Thiele method facilitate the design of a distillation column?

$8.$ Contrast the McCabe$$Thiele method with the Ponchon$$Savarit method in terms of what each accounts for in distillation design.