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On the other hand, some constants, such as K f (the freezing point depression constant, or cryoscopic constant), depend on the identity of a substance, and so may be considered to describe the state of a system, and therefore may be considered physical properties. "Specific" properties are expressed on a per mass basis.
Thermophysical properties are characteristics that control the diurnal, seasonal, or climatic surface and subsurface temperature variations (or thermal curves) of a material. The most important thermophysical property is thermal inertia , which controls the amplitude of the thermal curve and albedo (or reflectivity ), which controls the average ...
The three "standard" properties are in fact the three possible second derivatives of the Gibbs free energy with respect to temperature and pressure. Moreover, considering derivatives such as ∂ 3 G ∂ P ∂ T 2 {\displaystyle {\frac {\partial ^{3}G}{\partial P\partial T^{2}}}} and the related Schwartz relations, shows that the properties ...
A non-physical standard state is one whose properties are obtained by extrapolation from a physical state (for example, a solid superheated above the normal melting point, or an ideal gas at a condition where the real gas is non-ideal). Metastable liquids and solids are important because some substances can persist and be used in that state ...
Key thermophysical properties of phase-change materials include: Melting point (T m), Heat of fusion (ΔH fus), Specific heat (c p) (of solid and liquid phase), Density (ρ) (of solid and liquid phase) and thermal conductivity. The thermal properties of representative PCMs are shown below.
A system is composed of particles, whose average motions define its properties, and those properties are in turn related to one another through equations of state. Properties can be combined to express internal energy and thermodynamic potentials , which are useful for determining conditions for equilibrium and spontaneous processes .
Thermal diffusivity of selected materials and substances [12]; Material Thermal diffusivity (mm 2 /s) Refs. Pyrolytic graphite, parallel to layers: 1,220: Diamond: 1,060–1,160: Carbon/carbon composite at 25 °C
As quoted from this source in an online version of: J.A. Dean (ed), Lange's Handbook of Chemistry (15th Edition), McGraw-Hill, 1999; Section 4; Table 4.1, Electronic Configuration and Properties of the Elements Touloukian, Y. S., Thermophysical Properties of Matter, Vol. 12, Thermal Expansion, Plenum, New York, 1975.
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