Fig. 12. Relative errors in (a) volumetric heat capacity (C) and (b) thermal diffusivity (k) that occur when the model of Bristow et al. (1994) (Eq. [19–2]) is used to compute k and C rather than the model with zero surface temperature (ZST) boundary conditions (Eq. [15]). Relative errors are shown for sample heights (c) of 3, 3.2, 3.4, 12, and 21 cm and probe length (c₀) of 3 cm.