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hydraulics science of moving liquids
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Just as these two words are close in their scientific senses, they have similar figurative meanings.Scientifically, liquid is the narrower term, denoting a fluid, such as water or oil, that flows but has constant volume (at constant temperature and pressure). A liquid has no fixed shape and yields easily to external pressure; thus we can talk metaphorically about liquid assets (such as shares or commodities) that can easily be converted into cash, while a liquid market features much trading and continual price movements. Liquid is also used of things that are clear to the eye or ear ( liquid blue eyes | the liquid song of a bird ).In its scientific sense, fluid denotes anything that flows, including gases, which can change shape more dramatically than liquids. In figurative uses, a fluid situation is also very volatile, while fluid pricing , to which airline flights and package holidays in particular are now subject, means that their prices are varied continually, according to the demand from customers or the cash-flow requirements of the business. Fluid is also used to indicate effortless and graceful movement ( in one fluid movement, he picked up the bag and its contents ).