Changed from a solid or gas into a liquid state.
From Latin 'liquefacere' combining 'liquere' (to be liquid) and 'facere' (to make). The verb 'liquefy' appeared in English in the 16th century as chemistry and alchemy advanced.
Natural gas can be liquefied by cooling it down to -162°C, which is so cold that the molecules basically freeze mid-motion and stack together as liquid—it's one of the trickiest phase changes scientists deal with.
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