If you put a balloon in the freezer, several things may happen depending on the balloon's material and the temperature of the freezer:
Freezing and shrinking: If the freezer temperature is low enough, the air inside the balloon will cool and contract. As a result, the balloon will likely shrink in size.
Brittleness: Some balloons are made of rubber or latex, and exposure to very low temperatures can make them more brittle. The material may become stiff and susceptible to cracking or breaking when touched or manipulated.
Slow deflation: If the balloon is not airtight or has a small hole or leak, the cold temperatures might cause the air inside to contract and slowly escape through the hole. Over time, the balloon may deflate partially or entirely.
Ice formation: If there is any moisture or condensation inside the balloon, it could freeze when placed in the freezer. This frozen moisture might create small ice crystals or formations within the balloon.
It's essential to note that the behavior of the balloon in the freezer can vary depending on the balloon's material, the temperature of the freezer, and the duration of exposure. In general, it's not recommended to put balloons in the freezer as it can alter their properties and may lead to damage or failure.