Volumetric expansion coefficients of simple materials are often well cataloged. However, the thermal expansion coefficient ß of a human body is less well known. This could affect the human body's specific gravity and, therefore, measurements of its body-fat ratio. Suppose that a human body of weight wn on dry land is placed on a scale while completely immersed in formaldehyde of temperature Tj. Once the temperature increases by AT, the scale reading drops by Aw. Derive an expression for ßin terms of AT, wo, and Aw by assuming that the ratio of the density of formaldehyde pr and the initial density of the body pn is R = prlpp. Assume also that pr does not change when heated. B = If the body weighs 198.5 lb on dry land and his weight reading lowers by 0.135 lb when the formaldehyde is heated from 68.80 °F to 83.40 °F, calculate the coefficient of volume expansion of the body.* Assume R = 0.820. B = 1/°C The coefficient ß will likely vary widely from one human body to the next. The numerical value computed in this example should not be considered factual.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
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