EXAMIANS
Thermal diffusivity of a substance is
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Planck’s law holds good for
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Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)
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The amount of radiation mainly depends on
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Total heat is the heat required to
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The heat transfer by conduction through a thick cylinder (Q) is given by (where T₁ = Higher temperature, T₂ = Lower temperature, r₁ = Inside radius, r₂ = Outside radius, l = Length of cylinder, and k = Thermal conductivity)
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The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)
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Fourier's law of heat conduction is valid for
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Unit of thermal conductivity in S.I. units is
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Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)
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