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.
The majority of car accidents are caused by irresponsible driving behavior. Statistics also show that 98 % of car accidents involve a single distracted driver. Some common causes include: 1  Rubbernecking: Drivers slowing down their cars to watch what is going on. 2  Cell phones: Drivers using their commute time to make phone calls. 3  Driver fatigue. 4  Passenger distractions. 5  Looking at scenery.