it expands and causes pressure
Type your answer here... it gets thicker and thicker
The air warms and expands, becoming lighter than the surrounding air, thus lifting the balloon.
All the particles gain more energy (i.e from heat) and move quicker and therefore they spread out causing air to expand
It expands as the surrounding air pressure lessens. It also cools along with the ambient temperature.
It expands and cools
It expands.
It expands.
it expands and causes pressure
The air inside expands.
The balloon expands.
Type your answer here... it gets thicker and thicker
Cool, moist, heavy air replaces rising hot air
The air warms and expands, becoming lighter than the surrounding air, thus lifting the balloon.
All the particles gain more energy (i.e from heat) and move quicker and therefore they spread out causing air to expand
Air expands when it is heated.
Expands