air
Nitrogen is filled in aeroplane tyres.
Nitrogen
The occupants require it.
i think it to be 5 ft
pneumatic
Refer to the tire pressure chart on the drivers door.
You may be referring to a tire.
The tire, the air-filled rubber donut that meets the ground, is mounted on the rim.
A Scottish doctor, John Dunlop invented the first air filled rubber tire in 1888.
Bicycle tires have tubes, so you wouldn't have a tire filled with Slime. There are tubes pre-filled with Slime though.
35
A balloon or a tire can both be filled with air.