what is the reason weather balloons expand as they ascend?

Answer 1

Atmospheric air pressure decreases with altitude, so the balloon expands because the pressure difference between the gas inside it and outside it increases, increasing the net pressure on the balloon membrane from the inside.

Answer 2

Atmospheric pressure decreases with height.When the weather baloons(which are usually filled with light gases like hydrogen or helium) ascend,as the pressure outside is going on decreasing,the relative pressure inside the balloons is becoming more and more.The balloon is forced to expand due to this growing pressure inside and finally it bursts at a certain height.At that time it will be three or four times bigger than what it was at the time of release depending upon the thickness of the balloon.

Answer 3

They expand as the external pressure of the atmosphere decreases as the balloon ascends. This is due to the fact that there is less air above it at 50,000ft then say at sea level, so there is less pressure keeping the balloon small. As the pressure pushing the balloon smaller decreases, the air inside of the balloon is able to push outwards more and more, expanding the balloons size.

Answer 4

down on the floor the air pressure is high, the inner pressure is that big the balloon has his size, when the balloon go's up the air pressuree gets lower so the inner pressur of the balloon, who's pressing with the same force!"makes the size of the balloon bigger.

Answer 5

The air pressure decreases.