A method of finding values beyond those given is considered. By using a straight-line segment to extend a graph beyond the last known point, we can estimate values from the extension of the graph. The method is known as linear extrapolation. Use this method to estimate the required values from the given graphs.

Using Fig. 3.41, estimate T for t = 5.3min.

T (C) 150 140 130 0 1 2 3 Fig. 3.41 4 5 t (min)