Fig. 11. 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 adiabatic boundary conditions (ABC, Eq. [18]). Relative errors are shown for sample lengths (a) and widths (b) of 25, 28, 31, 35, 40, and 60 mm, probe length (c₀) of 4 cm, and sample height (c) of 5 cm.