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