Chapter 6 Behavior of Gases

When substances are in the Gas Phase, there is a unique result. All substances while in the gas phase behave the same. We can look at a few of these. In particular, gases follow certain LAWS, called the Gas Laws. Two of these are: Boyle’s Law - named after Robert Boyle (the same person who gave us the modern definition of an element) Charles’ Law

© 2010 Pearson Prentice Hall, Inc. Boyle’s law: At constant temperature, the volume of a gas is inversely proportional to its pressure. © 2010 Pearson Prentice Hall, Inc. 6/3

© 2010 Pearson Prentice Hall, Inc. Charles’s law: At constant pressure, the volume of a gas is directly proportional to its absolute temperature. © 2010 Pearson Prentice Hall, Inc. 6/4

Absolute Temperature is designated kelvins or K. Mathematically: K = °C + 273

© 2010 Pearson Prentice Hall, Inc. Charles’s Law Balloon At liquid nitrogen temp: -196°C or 77 K Same balloon at Room Temp © 2010 Pearson Prentice Hall, Inc. 6/6