The picture below shows how a hot balloon works. Summarize the information by selecting and reporting the main features.

The given diagram demonstrates the components of a hot

air

balloon

and its ascending mechanism.

Overall

, there are three main parts to a hot

air

balloon

, namely the basket, the burner and the

envelope

.

In addition

, the circulation of the

air

inside and outside the

balloon

enables it to fly. The lowest part of a hot

air

balloon

is the basket in which a propane cylinder is installed to provide fuel for the burner suspended over it. The inverted teardrop-shaped

envelope

above features a skirt which is used to attach the

envelope

with the basket through some ropes,

while

the

parachute

itself consists of multiple vertical gores. Each of these gores is made by sewing multiple small horizontal panels together

,

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and extends from the throat to the crown of the

parachute

. At the top of the

envelope

lies the

parachute

valve with a self-sealing flap which allows hot

air

to escape at a controlled rate. Moving on to the operation of the hot

air

balloon

, its ascent and descent depend on the circulation of

air

. The hot

air

inside the

envelope

is produced from the flame of the burner which is fueled by the propane-

air

mixture. As it is lighter than the cool

air

outside, the heated

air lifts

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airlifts

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the

parachute

and makes it buoyant. To make the

balloon

go up and down, the self-sealing flap at the crown of the

envelope

can be opened in

such

a way that the hot

air

escapes the

parachute

at a predetermined rate.