Experimental studies have shown that the condition for breakup of a droplet in a gas stream is W_e/R_e^1/2 = 0.5 where Re is the Reynolds number and We is the Weber number based on the droplet diameter. What diameter water droplet would break up in a 12 m/s airstream at 20°C and standard atmospheric pressure? The surface tension of water is 0.041 N/m.