What Happens:When you submerge the inflated balloon in ice water, the cold temperature causes the air inside to contract, causing the balloon to shrink.When you submerge the other balloon in hot water, the heat causes the air inside to expand, so the balloon gets bigger. Why This Happens:It’s because of a principle in science called thermal expansion:Cold = air molecules move more slowly → less space → balloon shrinksHeat = air molecules move faster → more space → balloon expands