1. (Units) a unit of heat in the fps system equal to the quantity of heat required to raise the temperature of 1 pound of water by 1Â°F. 1 British thermal unit is equivalent to 1055.06 joules or 251.997 calories.
Quick Answer. A major factor that usually causes tire noise is the air chamber inside the tire. The large void that is filled with air acts as a giant resonance chamber. Thus, the tires are something like donut-shaped drums that generate a low-frequency hum when tires are rolling.
It has been popularly believed that the car vibration is caused by the wheel alignment. Mostly, the vibration in car is caused by the damaged or unbalanced wheels or tires. In addition, the damage on the suspension, drivetrain, and steering components can also cause the annoying vibrations. However, there are some other causes of car vibrations. You can see in the following account.