warrenelec,
I have this data on a graph in units CHU/lb degree C.
at -50 its 0.37
0 its 0.414
50 its 0.46
100 its 0.51
150 its 0.568
200 its 0.63
250 its 0.708
Linear linear scale, X axis = t degree C, Y axis = specific heat, CHU/lb degree C. Plot it on regular graph paper X axis 5mm = 10 degrees C, Y axis 5mm = 0.01 CHU/lb degree C.
I can send the graph if required................