Answer: It decreases
Step-by-step explanation:
Charle's Law: This law states that volume is directly proportional to the temperature of the gas at constant pressure and number of moles.
(At constant pressure and number of moles)
where,
= initial volume of gas
= final volume of gas
= initial temperature of gas
= final temperature of gas
Therefore, as volume and temperature are proportional, if the temperature of the air in the balloon decreases, its volume also decreases.