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.
If the noise is occurring when drivi... Hello. If the noise is occurring when driving and going over bumps, then it may be a suspension part. Most of the time on this car, it is caused by a failing suspension strut. The struts will fail and not have any pressure which will cause this.