You place a balloon in a closed vacuum chamber at standard temperature and pressure (stp). you decrease the chamber temperature by half but keep the pressure constant. what happens to the balloon?

it doubles in volume.

it stays the same volume.

it expands to four times the original volume.

it reduces in size by half

if you do know the answer could you also explain it to me, ? i've gotten this on two quizzes and i pay attention to my lessons but i always get this one wrong.