CHE 131 Lecture Notes - Lecture 14: International System Of Units, Ideal Gas Law, Gas Constant

• School: Stony Brook University
• Department: Chemistry
• Course: CHE 131
• Professor: Benjamin Hsaio, Jiangyong Jia, Roy Lacey

Document Summary

Temperature changes have a large effect on the volume of a gas. Gases are much more compressible than liquids or solids. The si unit for pressure is pascal (pa). Gases tend to have lower densities than either liquid or solids, and their volume change greatly with changes in temperature or pressure. At fixed temperature and pressure, equimolar amounts of two ideal gases occupy equal volume. The ideal gas law is expressed as pv=nrt. in this equation, the symbol r indicates the ideal gas constant which may have different values depending on the unites used to express volume and pressure. The particles in a gas have a greater distance between them and the particles of a liquid or a solid and their movement is random. gas particles therefore move more freely than the particles of solids or liquids. Gases are highly compressible and occupy the full volume of their containers. When a gas is subjected to pressure, its volume decreases.