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!).
So much energy will be absorbed in fact, that the temperature will actually get colder than the normal freezing point of water! So now that you understand how cream (liquid) freezes to become ice cream (solid), make your own ice cream and enjoy!!!