At a temperature of 37 C (body temperature), what is the mean speed of oxygen in the atmosphere?

As described in example 1.7 in the book, the mean speed is given by . Using T = 273 + 37 = 300 K, R = 8.3145 J/(K mol) and M = 32 x 10-3 kg/mol one gets a mean speed of 445.5 m/s.