Plural of liquid; substances that flow freely and take the shape of their container, like water or milk.
From Old French 'liquide' and Latin 'liquidus' (flowing, liquid), from 'liquere' (to be liquid, melt). The root relates to 'liquefaction' and originally described the flowing nature of certain substances.
Scientists now understand that liquids are actually rare in the universe—most matter is either solid or plasma, so the existence of water and other common liquids on Earth is part of what makes our planet so chemically special.
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