Abstract
The velocity of second sound in 3He-4He mixtures was measured near their lambda transition temperatures under their saturated vapour pressure with molar concentrations of 3He of 0.449, 0.513, 0.544 and 0.560. Together with the data for lower concentrations previously reported, this gives information on the concentration dependence of the critical exponents, the amplitudes of second sound and the superfluid fraction. In particular, for the critical exponent, zeta , the universality concept seems to be satisfied for the concentration range up to 0.560 along the path of constant chemical potential difference, phi .
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