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Archimedes' principle: an object experiences a lifting force (buoyant force) equal to the weight of the fluid being displaced by the object.
Helium (He)and hot air are lighter than the normal air near the ground level. If the balloon is filled with He or heater air, near the ground level, the normal air that the balloon displaced has a heavier weight that the weight of He or hot air inside the balloon. The net force is up, assuming the balloon itself is weightless (the balloon fabric is so thin that the weight is negligible). When the balloon reaches the upper atmosphere where the surrounding air is as light as the hot air, the balloon will stop ascending.
What else can I help you with?
Why would heating the gas inan air balloon make the balloon rise?
because as you heat the gas, you cause the gas to expand on the container (whish is a balloon), this lowers the density, and a less dense fluid submersed in a denser fluid will rise, like an air bubble rises from underwater
How would you make a balloon get the maximum elevation it can get?
Make the balloon capable of further expansion. That way as the balloon rises and the barometric pressure falls the balloon can expand and allow its internal gases to achieve a constantly decreasing density.
What would happen if you put a balloon in the sun?
It would expand as the gases inside expand against the pressure of the skin of the balloon and the atmospheric pressure.
What would happen to a balloon if you filled it with cooler air and then placed it in the hot sun for an hour?
The cooler air inside the balloon would increase in temperature, causing it to expand and potentially burst the balloon. This is because gases expand when heated.
What would heating the gas in an air balloon make the balloon rise?
Simple...hot air rises..
What would cause a balloon to expand if taken to the of a mountain?
Lowered Pressure
Why can't a hot air balloon rise higher than it does?
Hot air balloons are limited in altitude because of adiabatic cooling. As you ascend in the atmosphere, the air becomes cooler. This alone would not be able to stop a balloon rising if there were enough fuel to continuously heat the air. However, as the balloon rises, the hot gas inside the balloon also rises. Logical right? When the gas rises, reduced pressure allows the gas to expand and as gases expand, the also cool. So, there will come a point, or pressure, where it become increasingly difficult to heat the air faster than it cools due to expansion and the balloon will stop rising.
What would happen if you inflated a balloon on the moon?
The balloon would expand due to the lack of atmosphere on the moon, but it wouldn't burst because the pressure inside the balloon would equalize with the low pressure outside. Additionally, the balloon would float in the lower gravity environment of the moon.
What would happen if a balloon that was blown up at a low altitude is brought to a high altitude?
The balloon would expand as it rises in altitude due to the decrease in air pressure. If it expands too much, it may pop or burst because the external pressure is lower than the internal pressure from the air inside the balloon.
What would cause balloon to expand if taken to the top of a mountain?
Lowered Pressure
What would cause a balloon to expand if taken to the top a mountain?
Lowered Pressure
What would cause a balloon to expand if taken to the top of the mountain?
Lowered Pressure
