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diffusivity

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diffusivity [dif·yü′ziv·əd·ē]
(thermodynamics)
The quantity of heat passing normally through a unit area per unit time divided by the product of specific heat, density, and temperature gradient. Also known as thermal diffusivity; thermometric conductivity.


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Services offered: Testing services for thermal expansion, thermal conductivity, thermal diffusivity and specific heat capacity
The principal factor controlling the exsolution is the diffusivity (D) of water in a melt; diffusivity is inversely dependant on viscosity ([eta]) and viscosity is inversely dependant on the water content of the melt (Burnham, 1967).
12) We attribute this finding to the high diffusivity of He, which permitted the gas to diffuse into poorly ventilated regions before PEP breathing treatment and therefore minimized our ability to measure any changes in ventilation distribution that might have occurred as a result of the PEP breathing treatment.
 
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