# gas_module_reader - Chem 111-Gases by William Sweeney...

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1 Chem 111-Gases by William Sweeney Outline A problem set on how to obtain functional relationships from data ....................................... 1 Introduction to gases ............................................................................................................ 6 Kinetic molecular theory of gases ....................................................................................... 14 Applications ....................................................................................................................... 20 Poster exam information ..................................................................................................... 25

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3 Why try to find a linear plot? The goal is to find the functional relationship, and obtaining a linear plot is actually the easiest approach. For your pressure/volume data, you will use linearity to find the functional relationship. This is done by plotting P vs. some function of V (such as V, V 2 , 1/V 1/V 2 , ...) with the goal of finding a straight-line (i.e., linear) plot. Your eye can tell with good accuracy if the plot is linear. If you find a linear plot, you can use the equation for a straight line (y = mx + b) to determine the mathematical relationship between your variables. This can best be seen by looking at an example.

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