so you have grip on the road.
Air
they are filled up with regular air that our tires use but some cheaters in monster truck racing fill their tires up with water to make sure they land on all fours.
pneumatic
Helium is lighter than air. So, tires filled will helium will help the tire rise up in the air.
The friction of the ground you drive on raises the temperature of the tire, which in turn raises the temperature of the air in the tire. Increasing the temperature of the air raises the air pressure of the tire by the air itself expanding. This only applies to atmosphere air filled tires. Nitrogen gas filled tires tend to keep from expanding at increasing temperatures, therefore, the pressure stays the same.
They are filled with air, which is a mixture of gasses, so yes they are filled with gas
In standard cars is it simply compressed air. The same mixture we breathe.
Aircraft tires can be filled with regular compressed air, however pure nitrogen is also often used.
They use air filled tyres, which is why you see them getting punctures.
It needs air to hold the tire so it can roll.
With the proper pressure, no.
That depends on who old/used the type is.