  We investigate the thermodynamics and dynamics of the electroweak phase
transition by modelling the infrared physics with classical Yang-Mills Higgs
theory. We discuss the accuracy of this approach and conclude that, for
quantities whose determination is dominated by the infrared, the classical
method should be correct up to parametrically suppressed (ie O(alpha))
corrections. For a Higgs self-coupling which at tree level corresponds to m_H ~
50 GeV, we determine the jump in the order parameter to be delta phi = 1.5 gT,
the surface tension to be sigma = 0.07 g^4 T^3, and the friction coefficient on
the moving bubble wall due to infrared bosons to be \eta = P/v_w = 0.03 \pm
.004 g^6 T^4. We also investigate the response of Chern-Simons number to a
spatially uniform chemical potential and find that it falls off a short
distance inside the bubble wall, both in equilibrium and below the equilibrium
temperature.
