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.
While I'm driving down the road, my car makes a really loud roaring noise, what do you think the problem is, could it be the struts or an alignment, the tires are new. I've also checked the bearings and they seem to be tight, the tire doesn't move when examined. Posted by tearsfromhea on.