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!).
When you bake a cake, energy is absorbed by the batter as it changes form a runny mix into a cake. Energy - Absorbed or Released. Another sign of a chemical change is the release or gain of energy by an object. Many substances absorb energy to undergo a chemical change.