If the volume of a gas increases while temperature is held constant, what happens to the pressure?

You should be able to tell that the pressure decreases when the volume increases because the P is at the bottom of the PTV manipulative. Use the manipulative to help you answer the following questions.

1. A balloon was inflated to a volume of 5.0 liters at a pressure of 0.95 atm. It rises to an altitude where its volume becomes 25.0 liters.
• Will the pressure around the balloon increase or decrease? (Click on the word increase or decrease to select the answer.)
  Try Again You are correct!
• What was the new pressure? Be sure to use the correct units. Check Your Answer 1
  0.19 atm
2. The living quarters of the space shuttle has a volume of air of 20,000 liters (2.00*10⁴ L) and is kept at pressure of 12.0 lbs/in². If all the air were lost, it would have to be replaced from a compressed air cylinder which has a volume of 50.0 liters.
• Would the pressure of the compressed air cylinder be less than or greater than 12.0 lbs/in²? (Click on the words "less than" or "greater than" to select your answer.)
  Try Again You are correct!
• How much pressure would it take to compress all the air in the shuttle into a 50.0 liter space? Check Your Answer 2
  4,800 lbs/in² or 4.8 * 10³ lbs/in²