The two diagrams describe the main parts of a hot air balloon and indicate how it works. Summarize the information by selecting and reporting the main features and make comparisons with relevant.

The diagram details the various components of a hot

air

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balloon

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and describes its mechanics. As is evident from the diagram, the three key parts of a hot

air

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balloon

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are the

envelope

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, the

basket

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and the

burner

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.

In addition

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, the hot

air

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balloon

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’s mechanism for ascending and descending revolves around the thermal regulation of

air

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. The main part of a hot

balloon

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is a large

envelope

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which has an inverted teardrop shape. At the top is the ‘parachute valve’ which is a self-sealing flap used to regulate the pace at which hot

air

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escapes. The large vertical sections below the valve are called ‘gores’, which are made up of smaller panels. The

envelope

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tapers into a small base called a ‘skirt’. The skirt is attached to the

basket

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using ropes, and the

burner

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hangs above the

basket

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. Inside the

basket

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are propane tanks which are used to power the

burner

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. Regarding the function of the hot

air

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balloon

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, the

burner

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combines regular

air

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with propane to heat the

air

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trapped inside the

envelope

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, which

then

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becomes lighter and

thus

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makes the

balloon

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buoyant.

To begin

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a descent, the

air

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is cooled and effectively becomes heavier, pulling the hot

air

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balloon

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downward.