Kinetic Theory Page:
Particle motion: atoms move in a straight line between collisions.
Pressure: the force of particles striking a surface.
- An O2 molecule in the air travels about 443 m/s (about 1700 km/hour) at 25 oC.
- The diameter of an O2 is about 0.339 nanometers. Each molecule travels about 314 times its own diameter between collisions. At this rate, each oxygen molecule has over four and a half billion collisions per second.
Temperature: a measure of the average kinetic energy of the particles of matter.
- The SI unit for pressure is the pascal, named for Blaise Pascal.
- The pascal is a derived SI unit equal to 1 Newton / m2
(1 N = (1 kg)(1 m) / s2)
- The average air pressure at sea level is 101.325 kilopascals (kPa).
Scientists call this average "standard atmospheric pressure".