Separating apparatus for separating components of a liquid mixture one from the other and method of separating such components.Liquid mixture to be separated is passed via inlet means (18) including a duct (40), to tangential inlets (20, 22) of a cyclone separator (10) so that the less dense component of the mixture emerges from an overflow outlet (34a) of the separator (10) and the more dense component emerges from an underflow outlet (16a) of the separator. Gas is entrained in the incoming liquid mixture in duct (40) by expressing the gas into the duct via a manifold (42a) having openings (42a). The gas is admitted under conditions of relatively high pressure of incoming mixture in duct (40) whereby to substantially dissolve in the mixture whereby to come out of solution in the form of fine bubbles under pressure reduction occurring inside the separator (10).