The calibration of a mercury thermometer intended for work of precision is best effected after it has been sealed. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 Various The calibration of a slide-wire, however, is much less troublesome than that of a thermometer tube for several reasons.
Most everyone knows that we use proteins, carbohydrates and fats for energy. Calories are measurement of a unit of heat or food energy. For example, we can achieve four calories per gram of proteins and carbohydrates, and nine calories per gram from fats.
The Concept of Energy Balance The concept of energy balance is based on the fundamental thermodynamic principle that energy cannot be destroyed, and can only be gained, lost, or stored by an organism. Energy balance is defined as the state achieved when the energy intake equals energy expenditure. This concept may be used to demonstrate how bodyweight will change over time in response to changes in energy intake and expenditure.