流体|りゅうたいryuutai[0]heiban (flat)

1. nounfluid

• Synonym流動物りゅうどうぶつWrittenWritten/formal prose. An object that has fluidity; can also mean liquid food (「流動食」). 「流体」 is the physics term.
• Synonym流動体りゅうどうたいWrittenWritten/formal prose. A substance that can flow and change shape; synonymous with 「流体」, which is the more common word.
• Antonym固体こたいNeutralA solid; the counterpart of 「流体」, which covers liquids and gases.

In physics, the collective term for liquids and gases is 「流体」, as in 「流体力学」. 「流動体」 means the same but is less common. For liquid food say 「流動食」; for a solid, say 「固体」.

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

1. 液体えきたいと気体きたいの総称そうしょう。