1. The problem statement, all variables and given/known data We blew up a balloon, attached a data logger inside the balloon. We then popped it and checked if the temperature increased or decreased. Most of the time, the temperature increased (from around 29 degrees Celsius to 29.2 degrees Celsius). Why is this so? 2. Relevant equations Ideal Gas Law: Pv= nRT (where n and R are constants) 3. The attempt at a solution My group is divided. One of us thinks that the balloon's temperature should have decreased, as the pressure decreases (following the Ideal Gas Law up there). But another of us thinks that it should have increased, because the volume increased more than the pressure did.