Pressure angle 25 degrees. Earlier gears with pressure angle 14.5 were commonly used because the cosine is larger for a smaller angle, providing more power transmission and less pressure on the bearing; however, teeth with smaller pressure angles are weaker. To run gears together properly their pressure angles must be matched. The pressure angle is also the angle of the sides of the trapezoidal teeth on the corresponding rack. The force transmitted during the mating of gear teeth acts along the normal. This force has components along the pitch line and the other along the line perpendicular to the pitch line. The
36 Degrees a performance "The average body temperature is 37 degrees. This is a song called 36 Degrees", further adding to the speculation. However, the term "36 degrees" also means two people who are not getting on in urban slang; therefore the idea of the song being written for a break-up could well be true. The other numbers mentioned have been said to just be random, as "they just seemed to fit" according to Molko. The music video, directed by Chris Cunningham, was shot primarily in a scuba diving pool and shows band members performing the song underwater. Some scenes were shot