Using nitrogen in car tires yields better fuel efficiency and longer tire life.
There are no "tire laws" for used car dealers.
Air or nitrogen is used to inflate tires
Nitrogen is used in many aircraft tires.
nitrogen
Nitrogen
It's nitrogen.
Compressed air or compressed nitrogen.
I think it is Nitrogen. The normal air mixture pumped into regular road cars is not efficient at high speeds and will lose pressure easily. If that happens there could be catastrophic consequence at high speed. That is why they use nitrogen If you pump nitrogen into the tires of your regular road car, you need not check tire pressure for 3 months.
There are some disadvantages to nitrogen, especially in inflation. Two disadvantages include the expense of nitrogen, and the fact that more tire maintenance will be needed if nitrogen is used.
If you have a nitrogen filled tire that is low you can put in regular compressed air to fill it up, but you will lose some of the benefit of the nitrogen. You should replace the green cap with a black one if you have filled the tire with regular air. 90% of cars on the road are just using regular compressed air, and not having a lot of problems. So I wouldn't worry too much about it.
Used tire changers are machines used by mechanics that help mount and dismount tires on cars, motorcycles and trucks. It has all the parts necessary to replace the tire from the wheel.
Two valves are needed when filling tires with nitrogen. One is used to allow existing air in the tire to be expelled as nitrogen flows in from the other valve. Once expelled, the second valve is closed so that the tire is 100% filled with pure nitrogen. Nitrogen is used because it does not absorb water as does the air we breathe and this allows the balancing of the wheel & tire to remain unaffected by moisture content in the air.