熱気|ねっきnekki[0]heiban (flat)

1. nounheat; hot air
   その部屋へやは参加者さんかしゃの熱気ねっきでムンムンしていた。↗

   The air in that room was thick with the enthusiasm of the participants.
2. nounenthusiasm; excitement; fervour; fervor; heated atmosphere
3. nounfever

• Synonym熱ねつNeutral「熱」 covers heat energy, fever and also passion; 「熱気」 is about hot air or the charged atmosphere of a place.
• SynonymヒートCasualLoanword for heat or things heating up, as in 「ヒートアップ」; 「熱気」 is the excited atmosphere itself.
• Related暑さあつさNeutral「暑さ」 is the heat of the weather and how it feels; 「熱気」 is hot air or an atmosphere, not the climate itself.
• Related高温こうおんWrittenWritten prose for high temperature, centred on the actual degree; 「熱気」 leans toward hot air and atmosphere.
• Related高熱こうねつNeutral「高熱」 means a high fever or intense heat, stressing how high the temperature is; 「熱気」 is hot air or a lively mood.
• Related情熱じょうねつNeutral「情熱」 is burning inner passion, the emotion itself; 「熱気」 is hot air or the energy a place radiates.
• Related熱情ねつじょうWrittenWritten word for ardent feeling and zeal; 「熱気」 is the lively atmosphere of a scene.
• Related熱さあつさNeutral「熱さ」 is how hot an object is to the touch; 「熱気」 is hot air spreading through a space.
• Related火熱かねつWrittenWritten word for the heat a flame gives off; 「熱気」 is hot air not tied to fire.
• Related暑気しょきWrittenWritten word for summer heat, strictly about the climate; 「熱気」 leans toward the buzz of a crowd.
• Related火照りほてりCasualColloquial word for the face or body feeling hot and flushed; 「熱気」 is air or atmosphere.
• RelatedほとぼりCasual「熱り」 is just another way of writing 「火照り」 — the same word, a hot flushed body; 「熱気」 is hot air or an excited mood.
• Antonym冷気れいきNeutralCold air or a chill — the opposite of 「熱気」 in its hot-air sense.
• Antonym寒気かんきNeutralCold air, the cold of the outdoors — the opposite of 「熱気」.

Choose 「熱気」 for hot air filling a place or the excited atmosphere of a crowd, as in 「会場が熱気に包まれる」. Use 「熱」 for heat energy or fever, 「暑さ」 for hot weather, and 「情熱」 for personal passion; 「冷気」 and 「寒気」 are its opposites.

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

1. 高温こうおんの気体きたい。
2. 暑あつさ。暑気しょき。
3. 奮い立ふるいたった意気込いきごみ。興奮こうふんして高たかまった気配けはい。
4. 病気びょうきによる発熱はつねつ。ねつけ。