If I understood the question correctly then the answer is definitely evaporation.
Answer: 72
Explanation: there is 48 teaspoons in a cup, take 48 then divide that by 2 u get 24 then u add 24 to 48 then u get 72
Density is the measure of how much mass is contained in a given volume.
C. Moosely
It is the Answer to your question.