Riya performs two set of experiments to study the length of the foam formed which are as follows :
Set I : She takes 10 ml of distilled water in test tube "A", and adds 5-6 drops of liquid soap in it and shakes the test tube vigorously.
Set II : She takes 10 ml of distilled water in a test tube "A" and adds 5-6 drops of liquid soap with half spoonful of CaSO4 in it and shakes the test tube. Write your observation and reason.