Fig. 8. Relative errors in (a) volumetric heat capacity (C) and (b) thermal diffusivity (k) that occur when the model of Bristow et al. (1994) (Eq. [19–20]) 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 of c = 4, 4.5, 5, 6, 8, 10, 12, 15, and 20 cm.