Atoms and molecules make up all of the different substances ... Click on “Methane” and tell students that methane is a gas that is used in gas stoves and for heating houses. Use the animation to show ...

Show the animation: Water Dissolving Salt ... Explain that as the water evaporates, water molecules go into the air. The water molecules that evaporate become a gas called water vapor. Only the water ...

The water gas molecules will occupy all the space inside the can since the air molecules have been pushed out. The hot gas molecules are the same pressure as the air outside the can. When the can is ...