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.
NorthTexasDriver 2011-01-27 17:14:29 UTC #1. We have a mystery: there's a clunking sound from our right front wheel when we turn, but our mechanic can't figure out why - he says the axle, struts and ball joint there all look fine. What else could be causing the sound - is he missing something important? This sound happens about 50% of the time on turns.