We discussed earlier some basic principles about the behavior of gases called the kinetic-molecular theory. Among other things, this theory suggests that gas molecules are in constant motion, and the average speed of the individual gas particles is dependent upon temperature – the higher the temperature, the faster the molecules move. It is not just gas particles that are in constant motion. The molecules and ions that make up liquids and solutions are also continually moving in nearly random directions. As a result, molecules and ions in a solution will collide with one another fairly frequently. As with gases, a temperature increase will produce an increase in the average particle speed.
As Matt prepared for his latest hot air balloon flight he lit the fire beneath the balloon opening and watch as the fabric of the balloon began to expand. Eventually is once flat balloon was fully expanded and ready for flight.
Is the air cooler inside or outside the balloon?