Today in chemistry I learned that the amount of gas, the volume, and the temperature are factors that affect gas pressure. An example is this is using a pump to force air into a raft increases the pressure of the air inside the raft. The strength and flexibility of the raft rely on the pressure of the gas inside the raft. The volume of the inflated raft is dramatically larger than the volume of the raft before it is inflated. As air is added, the raft expands to its intended volume. The pressure of the air inside the raft keeps the raft inflated.