

The Ideal Gas Law Objectives: 1. State the ideal gas law and describe its variables. 2. Describe the conditions in which the behavior of a real gas varies from that of an ideal gas. Key Terms: Ideal gas real gas gas constant Notes: (134) As we learned in the last lecture, the gas laws of Boyle, Charles, Avogadro, and Dalton merely explain the KineticMolecular theory. Each of the gas laws attempted to isolate situations where two of the four gas variables (T,V,P,&n) were related to each other in controlled conditions. As you know, life does not always come in such neat controlled packages. The ideal gas law attempts to combine all of the situational variables and express them in one single equation. The Ideal Gas Law: The ideal gas law attempts to describe the behavior of real gases under ideal conditions. Although most gases adhere to the ideal gas laws there are instances were they don't.
Ideal Gas Formula: PV = nRT or P_{1}V_{1}/nRT_{1} = P_{2}V_{2}/nRT_{2} In the above equation the new variable R is the gas constant (0.0821 atmL/molK). The value R is sometimes the universal gas constant and is used to predict the behavior of ideal gases. 
Last modified: February 25, 2003 