Please Help Me With My Esssay - IELTS Task 1

The picture illustrates the basic structure of a hot balloon and how it operates to fly high into the air.

A hot air balloon has three main parts: the basket, the burner and the envelop. The way it works could be explained by the movement of two flows of hot and cool air.

The bottom part of the hot balloon is the basket for carrying passengers. Two cylinder tubes containing propane are hidden inside the basket and connected with a burner to create fire. Attached to the basket with the ropes is an evelop whose shape resembles a huge balloon. A layer of skirt is coated at the bottom of the envelop. There are many lines of vertical gores on the envelop, each of which is split into rectangular panels. The envelop also has a round piece of parachute valve sealed at its top.

An air balloon could work by heating up the air inside its envelop. The propane tubes are the source to produce flame. Because the hot air is lighter, it would replace the cool air above it and create a force strong enough to push the balloon higher. The parachute valve then controls the hot air to escape steadily.

(202 words)

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