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 heat energy will cause the temperature of the ice to increase to 0ËC. As the ice continues to absorb heat energy from the air, the heat energy is used to break the bonds between H2O molecules in the hexagonal crystal structure of the ice. During this time, the temperature of ice and water remains 0ËC.