The British spelling of 'fluidize'; to convert a bed of solid particles into a fluid-like state by passing a gas or liquid through it.
From 'fluid' plus the verb suffix '-ise' (British convention, contrasting with American '-ize'), gaining currency in the 1920s-40s when engineers developed fluidized bed technology.
British chemists say 'fluidise' while Americans say 'fluidize,' but the technology is the same—it's literally making solid particles behave like liquid, which is one of engineering's coolest tricks.
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