How to Say "nitrogen" in Spanish
The Spanish word for “nitrogen” is “nitrógeno” — B1 level.

Examples
El aire que respiramos tiene mucho nitrógeno.
The air we breathe has a lot of nitrogen.
Las plantas necesitan nitrógeno para crecer fuertes.
Plants need nitrogen to grow strong.
El nitrógeno líquido es extremadamente frío.
Liquid nitrogen is extremely cold.
It's a Masculine Word
Since this word ends in '-o', it is masculine. You should always use 'el' or 'un' with it, for example: 'el nitrógeno'.
The Accent Mark
There is a written accent on the 'o' because the stress is on the third-to-last syllable. In Spanish, words with this specific rhythm always need an accent mark.
Forgetting the Accent Mark
Mistake: “nitrogeno”
Correction: nitrógeno (The accent is needed to tell you to put more emphasis on the 'tro' part of the word).
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