濃度

• Reading: のうど
• Romaji: noudo
• Kanji breakdown: 濃 (nou) — thick, dense, concentrated; 度 (do) — degree, measure
• Pronunciation: /noː.do/

Meaning

Concentration; density. The amount of a substance in a given volume or mixture.

A noun used in chemistry for the proportion of a solute in a solution, and more broadly for the intensity or strength of something. Common in scientific, environmental, and medical contexts. Common collocations include 濃度が高い (noudo ga takai, high concentration), 酸素濃度 (sanso noudo, oxygen concentration), アルコール濃度 (arukooru noudo, alcohol concentration), and 血中濃度 (ketchuu noudo, blood level).

Examples

1. このコーヒーは濃度が濃くて苦い。 This coffee has a high concentration and is bitter.
2. 大気中の二酸化炭素の濃度が年々上昇している。 The concentration of carbon dioxide in the atmosphere is rising year by year.
3. 血中アルコール濃度が基準値を超えると運転できない。 You cannot drive if your blood alcohol concentration exceeds the legal limit.

Usage Guide

Context: chemistry, environment, medicine

Tone: neutral

Origin & History

From Sino-Japanese: 濃 (nou, thick/dense/concentrated) + 度 (do, degree/measure). Literally 'degree of thickness' — a measure of how concentrated something is.

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal