EXPAND.
A warm air draft for a hot air balloon refers to rising pockets of warm air that lift the balloon. When the air inside the balloon is heated, it becomes less dense than the cooler air surrounding it, creating buoyancy that allows the balloon to ascend. Pilots use these warm air drafts to control the altitude and direction of the balloon.
it sinks
If there is warm air in the balloon, cooler air makes the balloon rise and if there is cold air in the balloon warmer air makes the balloon fall.
When a balloon full of air is moved from a cold place to a warm place, the air inside the balloon will warm up and expand. This causes the balloon to inflate further and possibly burst if the pressure inside the balloon becomes too high.
A balloon will keep air longer in a cool environment because cold air molecules move slower, leading to less pressure inside the balloon and less air escaping. In a warm environment, the air molecules move faster, causing higher pressure and more air to escape from the balloon over time.
Heating causes the air inside the balloon to expand. Some of the warm air leaves through the bottom opening of the balloon, keeping the pressure constant.
"Warm air", otherwise known as Hot Air Balloons, float because of one basic Law of Thermodynamics; heat rises. The air in a hot air balloon is hot, therefore, the balloon rises.
The air inside cools. Cool air shrinks. The balloon gets smaller.
Heating causes the air inside the balloon to expand. Some of the warm air leaves through the bottom opening of the balloon, keeping the pressure constant.
On a warm day, the air inside the balloon expands as the temperature increases. If the balloon is overinflated, the pressure from the expanding air can exceed the balloon's elasticity, causing it to pop. Additionally, the heat can weaken the material of the balloon, making it more prone to bursting.
Cold air is denser than warm air, therefore a balloon filled with cold air will weigh more than an identically sized balloon full of warm air. This extra weight causes the balloon to sink bellow warmer air. Cold air is denser than warm because as molecules become cooler they move more slowly causing them to be closer together.
The air inside expands.