窒素

• Reading: ちっそ
• Romaji: chisso
• Kanji breakdown: 窒 (chitsu) — suffocate, obstruct; 素 (so) — element, base, fundamental
• Pronunciation: /tɕis.so/

Meaning

Nitrogen (N). A chemical element that makes up approximately 78% of Earth's atmosphere.

A noun for the element nitrogen, important in chemistry, biology, and environmental science. Common collocations include 窒素酸化物 (chisso sankabutsu, nitrogen oxides/NOx), 液体窒素 (ekitai chisso, liquid nitrogen), and 窒素肥料 (chisso hiryou, nitrogen fertiliser). Also historically significant as the Chisso Corporation was responsible for the Minamata disease pollution incident.

Examples

1. 空気の約七十八パーセントは窒素で構成されている。 About 78% of the air is made up of nitrogen.
2. 液体窒素はマイナス百九十六度で沸騰する。 Liquid nitrogen boils at negative 196 degrees Celsius.
3. 植物の成長には窒素が欠かせない栄養素だ。 Nitrogen is an essential nutrient for plant growth.

Usage Guide

Context: chemistry, agriculture, environment

Tone: neutral

Origin & History

From Sino-Japanese: 窒 (chitsu, suffocate/obstruct) + 素 (so, element). Literally 'suffocating element' — named because nitrogen alone cannot sustain life, similar to the etymology of the French 'azote' (without life).

Cultural Context

Era: Modern

Generation: All ages

Social background: Universal