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When vehicle moves on uneven roads, the tyres filled with air absorb the shocks and make the ride comfortable. Fundamental property of air is compressibility and it enables he shock absorbing capacity. Air gets easily compressed to smaller volumes on application of pressure. Against this, water is not compressible. Hence, the shock generated on the tyres will be passed on to the vehicle leads to discomfort. In addition, wate filled tyres increase the rolling resistance of vehicles because of its weight. So a part of the engine's power and fuel is wasted to overcome this resistance.
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