密度

• 読み: みつど
• ローマ字: mitsudo
• 漢字の分解: 密 (mitsu) — dense, close, secret; 度 (do) — degree, extent, measure
• 発音: /mi.tsɯ.do/

意味

Density. The degree of compactness of a substance, or how closely packed something is.

A noun used in physics for mass per unit volume, but also widely used figuratively to describe the concentration or intensity of things. 人口密度 (jinkou mitsudo, population density) is one of the most common collocations. Also appears in 密度が高い/低い (mitsudo ga takai/hikui, high/low density). Figuratively used to describe packed schedules or rich content — 密度の濃い時間 (mitsudo no koi jikan, time packed with meaningful activity).

例文

1. 東京は世界でも人口密度が非常に高い都市だ。
2. 鉄は水より密度が大きいので沈む。
3. 今回の研修は密度の濃い三日間だった。

使い方ガイド

場面: physics, geography, everyday figurative use

トーン: neutral

起源と歴史

From Sino-Japanese: 密 (mitsu, dense/close/secret) + 度 (do, degree/extent). Literally 'degree of denseness' — how tightly packed something is.

文化的背景

時代: Modern

世代: All ages

社会的背景: Universal