Contact Webmaster Gas Laws Gases behave differently from the other two commonly studied states of matter, solids and liquids, so we have different methods for treating and understanding how gases behave under certain conditions. Gases, unlike solids and liquids, have neither fixed volume nor shape. They are molded entirely by the container in which they are held.
Pressure is measured as force per area.
The table below shows the conversions between these units. An equation that chemists call the Ideal Gas Law , shown below, relates the volume, temperature, and pressure of a gas, considering the amount of gas present. The Ideal Gas Law assumes several factors about the molecules of gas. The volume of the molecules is considered negligible compared to the volume of the container in which they are held. We also assume that gas molecules move randomly, and collide in completely elastic collisions.