A bubble that would ordinarily dissolve in a liquid may instead grow by a process known as rectified diffusion, if it is located in a sound field of sufficient pressure amplitude. Threshold conditions for bubble growth and the rate of bubble growth have been measured for air bubbles in air-saturated water at an acoustic frequency of 26.6 kHz. The experimental results are compared to newly calculated results based on a theory of rectified diffusion by Eller and Flynn [J. Acoust. Soc. Amer. 37, 493–503 (1965)]. The results refer to bubble radii from 15 to 90 μ and pressure amplitudes of less than 0.3 bar. For these conditions, it is found that the experimental and theoretical rectified-diffusion thresholds show rough agreement, but the measured rates of growth, for pressure amplitudes above the threshold, can be much greater than the calculated rates of growth.