Nitrogen
Definition 1 of 2
Pro Tip 1/3
Common Gas
Nitrogen is invisible and non-reactive at room temperature, unlike oxygen which supports combustion. Despite being so common, nitrogen does not burn or support fire.
Pro Tip 2/3
Invisible but Crucial
Nitrogen is essential for living organisms to create proteins, although we cannot see or smell it. Plants absorb nitrogen from the soil to grow.
Pro Tip 3/3
Used in Phrases
The phrase 'nitrogen cycle' refers to the continuous movement of nitrogen in different forms in nature. The nitrogen cycle is a key concept in understanding ecology.