Pressure & KMT

• CHARACTERISTICS OF GASES

  • Have no definite shape and volume
  • Have lower densities
  • Diffuse very rapidly
  • Compressible
• created when gas particles move and collide with the walls of the container

  Pressure
• measures ATMOSPHERIC PRESSURE

  Barometer
• measures pressure in a CLOSED system

  Manometer/pressure gauge
• Earth is equivalent to 1 atm
• 1 atm = ___ torr

  760
• 1 atm = ___ mmHg

  760
• 1 atm = ___ kPa

  101.3
• 1 atm = ___ psi

  14.7
• L should be the unit of volume in Ideal Gas Law
• 1L = 1000mL
• Standard Pressure and Temperature (STP)

  • T = 0 degrees C or 273K
  • P = 1 atm
• Energy in moving objects

  Kinetic Energy
• The Kinetic Molecular Theory (KMT) describes the behavior of matter in terms of particles in motion.
• KMT:

  1. The gas consists of minute particles
  2. The gas particles are in CONSTANT, RANDOM, and STRAIGHT-LINE motion
  3. The gas particles are considered as hard spheres with PERFECTLY ELASTIC COLLISION
  4. The interaction among gas particles is negligible
  5. The average kinetic energy of a gas is DIRECTLY PROPORTIONAL to its absolute temperature