蒸気・蒸汽|じょうきjouki[1]atamadaka (head-high)

1. nounsteam; vapour; vapor
   そのエンジンは蒸気じょうきで動うごく。↗

   The engine is driven by steam.
2. nounsteamboat; steam locomotive

• SynonymスチームNeutralA loanword for steam, used mainly for irons and heating, as in 「スチームアイロン」.
• Synonym水蒸気すいじょうきWrittenLeans toward science: the technical term for water vapour, focusing on water in its gaseous state rather than visible steam.
• Synonym湯気ゆげNeutralThe white steam rising from hot water or food; the usual word in everyday speech.
• Related湯煙ゆけむりNeutralSteam rising from hot springs or baths, with a scenic, atmospheric flavour.

Use 「蒸気」 for steam in general and for steam engines and locomotives. In scientific contexts choose 「水蒸気」; for steam rising from hot food or water, 「湯気」; for hot-spring steam, 「湯煙」.

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

1. 液体えきたいが蒸発じょうはつ又または固体こたいが昇華しょうかして気体きたいとなった状態じょうたいのもの。水みずの蒸気じょうきが圧倒的あっとうてきに多おおいので、水蒸気すいじょうきの事ことを蒸気じょうきと略りゃくする場合ばあいもある。
2. 湯気ゆげ。