Physical Characteristic of Gases Chapter 13 Chemistry

The Kinetic-Molecular Theory of Matter The kinetic-molecular theory is based on the idea that particles of matter are always in motion. The theory is used to explain properties of solids, liquids, and gases.

The Kinetic-Molecular Theory of Matter An ideal gas is an imaginary gas that perfectly fits all the assumptions of the kinetic-molecular theory. http://id.mind.net/~zona/mstm/physics/mechanics/energy/heatAndTemperature/gasMoleculeMotion/gasMoleculeMotion.html

The Nature of Gases Expansion- gases do not have a definite shape or volume Compressibility- Gases can be forced to fit in a smaller volume Diffusion- spontaneous mixing of particles. http://www.absorblearning.com/media/item.action?quick=b7

A Real Gas A Real Gas is a gas that does not behave completely according to the assumptions of the theory

Pressure Pressure is defined as force per unit area on a surface. Pressure = Force Area

Atmospheric Pressure

Atmospheric Pressure

Measuring pressure A barometer is a device used to measure atmospheric pressure

Units of Pressure One atmosphere is the average atmospheric pressure at sea level and 0o C. 1 Atm = 760 mmHg 760 torr 101.3 kPa

Standard Temperature and Pressure Standard Temperature and Pressure (STP) are the standard conditions of exactly 1 atm and 0O C.