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<p>(J/(m<sup>3</sup>·K)).</p>

<p>Thermal diffusivity is a positive <a href="page.php?w=coefficient">coefficient</a> in the <a href="page.php?w=heat_equation">heat equation</a>:</p>

<p>One way to view thermal diffusivity is as the ratio of the <a href="page.php?w=time_derivative">time derivative</a> of <a href="page.php?w=temperature">temperature</a> to its <a href="page.php?w=Second_derivative">curvature</a>, quantifying the rate at which temperature concavity is "smoothed out". In a substance with high thermal diffusivity, heat moves rapidly</p><p>
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