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!).
1 Melting ice - when ice melts, it takes in energy from the outside region causing it to become liquid. Once ice has become liquid, it will evaporate as vapor which will still be an endothermic process.  Cooking an egg - this is also a process that involves absorption of heat energy.