固体|こたいkotai[0]heiban (flat)
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- no-adjectivesolid (body); solid matter; solid-state
- Synonym固形こけいNeutralNoun for something solid with a fixed shape; mostly for foods and fuels, as in 「固形燃料」, 「固形スープ」.
- SynonymソリッドNeutralLoanword meaning solid and firm, mostly adjectival: 「ソリッドな音」, 「ソリッドカラー」. 「固体」 is the term for the physical state of matter.
- Antonym液体えきたいNeutralLiquid matter, as in 「液体洗剤」; the state opposite to 「固体」.
- Antonym気体きたいNeutralGaseous matter, as in 「気体が膨張する」; the state opposite to 「固体」.
Use 「固体」 for the solid state of matter (「固体燃料」, 「固体になる」). For block-shaped foods and fuels, say 「固形」; to describe firmness use the loanword 「ソリッド」. Opposites: 「液体」 and 「気体」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only


