Answer to Question 1
Reconstituted non-fat milk solids will result in the largest volume of milk foam; however, the stability of this foam is limited due to the lack of fat. Whipping cream expands to two to three times its volume and evaporated milk expands to three times its volume. Whipping cream and evaporated milk produce more stable foams.
Answer to Question 2
Milk foams are used in desserts and coffee to enhance flavor and textural properties.