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!).
It takes 80. calories of heat energy to melt 1 g of ice. This is the heat of fusion (Hfusion) for ice (heat. required per gram of substance). In order to determine the heat of fusion for ice, we need to melt some ice and. measure how much heat energy is absorbed. The ice needs to be isolated from its. surroundings, so we place it in an insulating Styrofoam cup, which is a simple device. called a calorimeter (heat measurer).