1.
heat; hotness
The degree or quality of being hot to the touch. Refers to the temperature of objects, liquids, or food.
スープの熱さに驚いた。
I was startled by how hot the soup was.
お茶の熱さがちょうどいい。
The tea is just the right temperature.
鉄板の熱さで手をやけどしそうになった。
I almost burned my hand on the hot iron plate.
2.
passion; fervor; intensity
Figurative heat — the intensity of emotions, enthusiasm, or devotion.
ファンの熱さに感動した。
I was moved by the fans' passion.
彼の仕事への熱さは本物だ。
His passion for work is genuine.
選挙運動の熱さが日に日に増している。
The intensity of the election campaign is growing day by day.
The noun form of 熱い (hot to the touch). Formed with the suffix ～さ, which converts adjectives into nouns indicating degree.
COMMON COLLOCATIONS:
- 熱さに耐える: to endure the heat
- 熱さを感じる: to feel the heat
- 熱さが冷める: for the heat/passion to cool down
SIMILAR WORDS:
- 暑さ: heat (weather) — refers to hot weather, not the temperature of objects
- 厚さ: thickness — same pronunciation, completely different meaning
- 温かさ: warmth — gentler than 熱さ; pleasant rather than intense