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Q: what is the theory behind the determination coefficient of cubical expansivity of glycerine using specific gravity bottle?
A: Thermal Expansion Coefficients of expansion Coefficients of thermal expansion are normally described either as the increase in length (or volume, esp. for liquids) per unit length at a given temperature, known as the expansivity, ?. [ = (l/L)(dL/dT), or as the mean expansion coefficient over a temperature range, = (1/L0)(?L/?T), where L is the instantaneous length, L0 is an initial length, T
is temperature, and ?L and ?T are changes in length referenced to a temperature at which L0 was measured. The latter form is more common than the former in engineering texts. Significant differences in numerical data can arise between the two methods. In this section, expansivity data only are given. The latter form can be determined from the former by integration over ?T. To a first approximation, cubical or volume expansivities of solids are three times the linear expansivity. ]
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