T.O. 33B-1-1Glossary 100ZZ: Symbol for acoustic impedance.ZIRCON SAND: A highly absorptive material used as a blocking or masking medium for drilled holes, slots and highlyirregular geometric parts to reduce or eliminate scattered radiation.ZONE MELTING: Highly localized melting, usually by induction heating, of a small volume of an otherwise solidpiece. By moving the induction coil along the rod, the melted zone can be transferred from one end to the other. In abinary mixture where there is a large difference in composition on the liquidus and solidus lines, high purity can beattained by concentrating one of the constituents in the liquid as it moves along the rod.
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