NCERT Solutions for Class 9 Science Chapter 1
Matter in Our Surroundings
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-9
Questions No-4
Suggest a method to liquefy atmospheric gases.
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By applying pressure and reducing the temperature, atmospheric gases can be liquefied.
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The atmospheric gases are taken in a cylinder with piston fitted on it. By cooling and applying pressure on them, the gases can be liquefied.
Liquid atmospheric gases such as nitrogen, oxygen and argon can be obtained through a process called cryogenic liquefaction. In this process, gases are cooled to a minimum temperature below their boiling point, cooling them to their liquid state Here is an overview of the process:
1. Compression: The first step is to compress the atmospheric air to increase its pressure. This pressure increases the temperature of the air due to increased pressure.
2. Cooling: Once forced, the air passes through a series of heat exchanger and cooling systems. Various cooling methods such as Joule-Thomson expansion, gas expansion in a turbine, or cryogenic cooling are used to cool the gas rapidly These methods significantly lower the temperature of the gas.
3. Expansion: The cooled and compressed air can then be expanded rapidly through a valve or nozzle. This expansion further decreases the gas temperature by the Joule-Thomson effect, which reduces the temperature as the gas expands.
4. Separation: As the gas cools, it reaches a temperature below its boiling point, causing it to evaporate. The water is separated from the residual gas by distillation and other processes, where the condensed water is collected separately from the residual gas
5. Storage: The effluent is stored in special cryogenic vessels capable of maintaining very low temperatures. These molds are well insulated to prevent heat loss from the surroundings, stabilizing the moistened air.
This process of cryogenic liquefaction is used in industries to produce large quantities of liquefied gases for various applications, including medical, industrial, and scientific purposes. It requires specialized equipment capable of handling extremely low temperatures and high-pressure gases.