ATOMIC HEATS OF SOLIDS 6 Further Consideration of Einstein's Expression for Atomic Heat. Einstein's expression, viz.— ,^o./x(A^^^ C„= 3R- (^^o"/T _ r)-2 lias been applied to several metals and solid salts. The following two Atomic JVe.i(fht Fig. 8. •examples, at low temperatures, given by Nernst and Lindemann [Zeitsch. ElektrocJiem., 17, 8i8, 191 1), are instructive:— Temperature, Absolute. Copper. /?ov = 240.