How to Write 硝 (xiāo) — Meaning “nitre / saltpeter”

Imagine a small stone (石) that looks like a little face (肖) — this stone is actually saltpeter, a key ingredient in making gunpowder. When gunpowder burns, it creates smoke, so link 硝 to the word 硝烟 (gunsmoke). Picture the stone exploding into white smoke.

The left radical 石 must be narrow and tall, taking about one-third of the character width. The right part 肖 consists of 小 (small) on top and 月 (moon) below — be careful that the bottom of 月 is not too wide, and keep the strokes evenly spaced. A common mistake is making the 石 too wide, which makes the character unbalanced.

硝 (saltpeter) uses the phonetic component 肖, while 砝 (fǎ, a weight) uses 去 (qù) and 砟 (zhǎ, broken stone or coal gangue) uses 乍 (zhà). Visually, the right parts are completely different: 硝 has 肖, 砝 has 去, and 砟 has 乍. In meaning, 硝 is about a specific chemical mineral, 砝 relates to weights used on scales, and 砟 refers to small pieces of rock or coal.

硝 appears in words like 硝烟 (xiāo yān, "gunsmoke") to describe smoke from gunfire, and 硝酸 (xiāo suān, "nitric acid"), a strong acid used in industry. It also appears in 硝石 (xiāo shí, "saltpeter"), which was historically important for making gunpowder in ancient China, giving the character a cultural link to military history.

Common words containing 硝 include: 硝烟 (xiāo yān) — gunsmoke; 硝石 (xiāo shí) — saltpeter; 硝酸 (xiāo suān) — nitric acid.