- When the air inside the balloon gets warm it makes the balloon lighter so it floats up, and when the air cools the balloon gets heavier and comes down.
- Warm air in a balloon makes it rise because it becomes lighter, but when the air cools the balloon becomes heavier and falls back down.
- If the air inside the balloon heats up the balloon goes up into the sky, and when the air cools it gets heavy and goes down.
- The balloon rises when the air inside is warm and light, and it drops when that air cools and becomes heavier.