The acoustic nonlinearity parameter B/A of a liquid containing microbubbles
, sonicated dextrose albumin, has been measured by using second harmonic in
sert-substitution method. Results show that the value of nonlinearity param
eter B/A for a bubbly liquid is significant and it obviously increases with
increase of bubble number density. The high nonlinearity of the bubbly liq
uid is mainly dependent on the microbubble nonlinear oscillation.