The threads are different on Nitrogen tanks. There are adapters to use a Co2 gauge on a nitrogen bottle .
Free nitrogen is in the air but fixed nitrogen is in the soil.
Normal air is 20% oxygen, 79% nitrogen, and 1% other gasses.
Nitrogen is much more stable in all temperatures and better for high speed driving.
Liquid nitrogen is made by taking in air from the atmosphere and compressing and cooling it. Once it is cool enough, it forms a liquid. This liquid contains argon, oxygen and nitrogen. These elements are then separated and sold as a commodity. The temperature is the only difference.
The air we breathe is mostly nitrogen, so yes. Nitrogen acts almost exactly the same as nitrogen mixed with a little oxygen. The major difference is that nitrogen will have less moisture then straight air.
The rubber used in tires is somewhat more permeable to oxygen than it is to nitrogen, so inflating tires with nitrogen keeps them at their recommended inflation pressure longer.
Air is approximately 80% Nitrogen, 19% oxygen and 1% others
nitrogen cycle
The organisms that are involved in the movement of nitrogen between the air and soil and back to the air are plants and bacteria. When plants decompose they release nitrogen and bacteria fixes nitrogen back into the air.
Nitrogen doesn't contain air, but the air contains Nitrogen.
Double-pane windows have nitrogen gas or very dry air between the panes for a very specific reason. Ordinary air will build up moisture between the panes.
All life forms need nitrogen to grow. Animals can get it from eating plants. But plants must get it from the soil. Fixed nitrogen (in the forms of nitrate ions - NO3-) is the only type of nitrogen that can be found in the soil.Note that nitrogen (as a gas - N2) makes up most of the air. Most plants can not use it because the molecules are triple-bonded.