These questions are a quick overview of the topics in this lesson. You are not expected to know this material before hand. The questions are intended to help you focus on material in the lesson. After you have studied the lesson you should be able to answer these and even more complicated questions. A solid is converted to the liquid at the melting point.
Gas density is the same at all temperatures.
The average kinetic energy of gas molecules depends on Kelvin temperature. Air pressure changes with altitude. The psi ratings in tires on equipment indicate the weight of gas inside. One atmosphere pressure is 14.7 psi at sea level. One atmosphere pressure equals 760 mm Hg.