Beginning in the seventeenth century, experimenters and investigators documented the physical properties of gases. These laws describe “ideal gases” rather than real gases, but real gases perform so closely to ideal gases that the equations are valid for all but the most extreme cases.
The three most important gas laws (at least for the purposes of this book) describe the relationship between the temperature, pressure, and volume of a gas. There are additional gas laws, but these three will serve to provide a foundation for understanding the physical properties of propane described in this book. Additionally, there is a fourth combined gas law that that merges the three primary laws into a one statement.