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प्रश्न
Connect with sports Air is not a pure substance. It helps us in many ways from breathing to playing. Balloon sports are a very popular sport. Hot air is lighter than cool air. So, the balloons filled with hot air rise up. Find out more about hot air balloons.
उत्तर
The hot air balloon consists of three parts: an envelope- which contains heated air, basket, and burner system which creates an open flame by burning a mix of liquid propane and air.
The basic principle behind hot air balloons is the use of hot air to create buoyancy, which generates lift.
Hot air weighs less than the same volume of cold air because it is less dense. It means that hot air will rise up and float when there is cold air around it.
Nowadays, most hot air balloons are made of nylon. The melting point of this material is approximately 230° C. The temperature inside a hot air balloon is usually kept below 120° C.
Hot air balloon festivals are held annually in many places throughout the year, allowing hot air balloon operators to gather- as well as for the general public to participate in various activities.
Hot air balloon flights are not possible in the rain. This is because the heat inside of the balloon can bring rain to boiling temperatures on top of the balloon, thereby destroying hot air balloon fabric.
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संबंधित प्रश्न
Air is a pure substance.
Which of the following are pure substances? Ice, Milk, Iron, Hydrochloric acid, Mercury, Brick and Water.
A ______ substance is made up of only one kind of particle.
Complete the Analogy.
Made up of one kind of particles: Pure substance:: Chemical combination of two or more element: ______.
Give any two characters of a pure substance.
Name the process associated with the following
Dry ice is kept at room temperature and at one atmospheric pressure.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
The allotropic form of a non-metal is a good conductor of electricity. Name the allotrope.
Iron filings and sulphur were mixed together and divided into two parts, ‘A’ and ‘B’. Part ‘A’ was heated strongly while Part ‘B’ was not heated. Dilute hydrochloric acid was added to both Parts and evolution of gas was seen in both cases. How will you identify the gases that evolved?
How are pure substances classified?
Name some substances that are sublime.
