A hot air balloon pilot wants the balloon to quickly rise several feet higher so it will be above some trees in the distance. Which best explains how the pilot can make the balloon rise?

The pilot can adjust the temperature inside the balloon so it is equal to the temperature of the surrounding air.
The pilot can adjust the density of the air inside the balloon so it is equal to the density of the surrounding air.
The pilot can decrease the temperature inside the balloon so it is cooler than the surrounding air.
The pilot can increase the temperature inside the balloon so it is warmer than the surrounding air.

For the balloon to get an uplift , it should be lighter than air . That means the density of the gas inside should be less than the density of air outside . only then , weight of the balloon plus the weight of the air inside balloon will become less than the weight of displaced air outside . This can be achieved by warming up the air inside. Its temperature must exceed that of outside air.

temdan2001 temdan2001 · Answer 2 · 2021-10-11T13:56:02+02:00

The option that best explain how the pilot can make the balloon rise is option D. The pilot can increase the temperature inside the balloon so it is warmer than the surrounding air

An object will float in air when the density of the object is lower than the density of the air.

Increase in temperature of a gas decreases the density of the gas.

For the pilot to make the balloon rise, he must find a way to make the balloon more lighter than air. To do this, he has to increase the temperature of the balloon.

In this question, the pilot can increase the temperature inside the balloon so it is warmer than the surrounding air in order for the balloon to quickly rise several feet higher above some trees in distance.

Therefore, option D best explain how the pilot can make the balloon rise.

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