Thermal lag

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Thermal lag describes a body's temperature with respect to time as a result of its thermal mass. A body with high thermal mass (high heat capacity and low conductivity) will have a large thermal lag. ^{[citation needed]}

${\displaystyle {\text{Thermal Lag}}(s)={L \over {\sqrt {2\alpha \Omega }}}}$ ^{[citation needed]}

where ${\displaystyle \alpha }$ is the thermal diffusivity of the material (m²s⁻¹), ${\displaystyle \Omega }$ is the external angular frequency (s⁻¹), and ${\displaystyle L}$ is the thickness (m). ^{[citation needed]}