Maslow's Hierarchy of Needs. Definition. Maslow's hierarchy of needs is a theory of motivation and personality developed by the psychologist Abraham H. Maslow (1908â1970). Maslow's hierarchy explains human behavior in terms of basic requirements for survival and growth.
When you use ice to cool the ingredients for ice cream, the energy is absorbed from the ingredients and from the outside environment (like your hands, if you are holding the baggie of ice!).
The more ice cream that is in immediate contact with air, the faster it will melt. A lower surface area to volume ratio speeds melting because the air can share its heat energy with more of the ice cream at one time. Imagine how much easier it is to for an ice cream flake to melt than a ball of ice cream. For the ice cream to completely melt, the air has to share its heat energy with the ice cream on the surface and the ice cream on the surface has to share its heat energy with the ice cream in the interior of the flake or ball.