A steel cylinder is filled with a gas. The initial pressure of this gas is 5.00 atm, and the initial temperature is 200.00 °C. The cylinder is heated to a final temperature of 400.00 °C. It appears that the temperature has doubled, but the final pressure is not 10.0 atm. Why doesn’t the pressure double as it did in the previous example? What is the final pressure? What valuable lesson does this question teach you?