How to say "fluid" in Japanese

• 水分すいぶんJLPT N2approx.Common
  nounCovers water content or moisture in food, the body, or soil. When 'fluid' means the water in or lost from a body, as in taking in fluids, this is the natural choice.
  水分すいぶんをたくさん取とってください。↗

  You should drink a lot of liquid.
• 液えきJLPT N1approx.Common
  noun, noun (suffix)A liquid or fluid as a substance, often one held or secreted somewhere, such as in the body or in a container. A concise, slightly technical-sounding word for liquid or fluid.
  その液えきはいやな臭においを発はっした。↗

  The liquor gave off a sickly odor.
• 流体りゅうたいCommon
  nounThe scientific and technical term for a fluid as a substance that flows, as in physics or engineering. Use this when discussing gases and liquids together as fluids.
• 流動的りゅうどうてきCommon
  na-adjectiveNot a physical fluid at all: this describes a situation or state as fluid, that is, unsettled and liable to change. Use it for fluid circumstances, plans, or conditions.
  経済けいざい情勢じょうせいは流動的りゅうどうてきである。↗

  Economic conditions are in a state of flux.
• 水みずJLPT N5approx.Common
  nounThe ordinary word for water; its gloss as fluid applies especially to fluid in animal tissue. Outside that biological context, it is seldom the word you want for 'fluid'.

Use 流体 for fluid in the physics sense, 液 for liquids in containers or the body, 水分 for moisture/fluids in the body, 水 for bodily fluids, and 流動的 for the figurative 'unsettled' sense.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 水分すいぶんwater
• 液えきliquid
• 流体りゅうたいfluid
• 流動的りゅうどうてきfluid
• フルードfluid
• 流動物りゅうどうぶつfluid
• 流動体りゅうどうたいliquid
• 水みずfluid (esp. in an animal tissue)
• 滑らかなめらかsmooth (of an action, proceedings, etc.)
• 津液しんえきfluid (in Chinese medicine, esp. a colourless bodily fluid, e.g. tears)