KMT Assumptions:
KMT Assumptions Particles are in constant, random, straight line motion. They possess energy in motion, kinetic energy. The actual volume of gas particles is negligible. Particles are far apart.
KMT Assumptions:
KMT Assumptions Gas particles do not attract or repel. The average kinetic energy of a collection of gas particles is directly proportional to the Kelvin temperature of the gas.
KMT Assumptions:
KMT Assumptions Collisions between gas particles and between particles and container are “elastic” collisions An elastic collision means no loss of kinetic energy (KE)
Real Gas vs Ideal Gas:
Real Gas vs Ideal Gas KMT breaks down at low temperatures and very high pressures KMT breaks down the more polar the gas is ---- Helium gas is more ideal that water vapor
Pressure:
Pressure Pressure is defined as the force per unit area on a surface ….. Pressure = force/area (N/cm 2 or N/m 2 ) Earth’s atmosphere pushes down on us with pressure of 10.1 N/cm 2 (1.03 Kg per cm 2 )
Slide 7:
Measuring Pressure - Barometer
Units of Pressure:
Units of Pressure 1 mm Hg – milliters of Mercury 1 torr = 1 mm Hg 1 atm = 760 mm Hg = 760 torr (average atmospheric pressure at 0 o C at sea level) SI Unit is the Pascal (Pa) – Pressure of one Newton acting on 1 m 2 1 atm = 101.325 kPa
Standard Temperature and Pressure:
Standard Temperature and Pressure 1 atm 0 o C Called STP