飛機tire點解係air-filled而唔係solid

Tyres of aircraft (NOT tire, which is a verb and has entirely different meaning) are usually air filled. It is because air, being a gas, is more easily compressible than a solid. This can reduce the impact force when the plane touches the ground on landing.
Also, by changing the pressure of air inside the tyre, the hardness of the tyre can be adjusted, such that the tyres could be used to suit different runway surface roughness and loading of the plane.

The tires have to be elastic(彈性) because when it lands and take off, a tremendous force is applied on the ground by the tires. If they are elastic, then the plane body and everything inside have to only bear a small force. If they are not elastic, then the body of the plane and everything inside has to bear a tremendous force and perhaps damaging them.

THere are many other reasons such as the price using tires of air-filled maybe lower than that of solid but these concerns are out of reach by physics.

2009-01-06 18:53:36 補充：
tyres. Thank you for reminding