Astm Table 54 Excel High Quality May 2026

VCF = 1 - a dt + b dt^2 - c dt^3 + d dt^4 ...

But Excel-friendly: In cell B6:

[ VCF = \exp\left[-\alpha_15 \Delta t (1 + 0.5\alpha_15 \Delta t + \frac16\alpha_15^2 \Delta t^2 + \dots)\right] ]