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Suggest a method to liquefy atmospheric gases.

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CBSE/Class 9/Science Tuition/Class IX-X Tuition

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Air is compressed to a high pressure and then expanded repeatedly through an expansion valve or an expansion turbine when the Joule-Thomson effect reduces its temperature in each cycle till ultimately it becomes liquid. This liquid air is then passed through a vertical separation column where each of... read more
Air is compressed to a high pressure and then expanded repeatedly through an expansion valve or an expansion turbine when the Joule-Thomson effect reduces its temperature in each cycle till ultimately it becomes liquid. This liquid air is then passed through a vertical separation column where each of its constituents like Oxygen, Nitrogen, Argon are separated at different levels taking advantage of their different boiling points. read less
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Decreasing temperature or increasing pressure.
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The atmospheric gases exist as liquids at very low temperatures such as -150 °C or - 200°C. To liquefy such gases by cooling is practically very difficult. Only a few gases are cooled to liquefy them. To liquefy a gas we need to bring the gas molecules together very close to each other. This... read more

The atmospheric gases exist as liquids at very low temperatures such as -150 °C or - 200°C. To liquefy such gases by cooling is practically very difficult. Only a few gases are cooled to liquefy them. To liquefy a gas we need to bring the gas molecules together very close to each other. This is achieved by compressing them using high pressures. At very high pressures, the boiling point of the liquid rises. So at practically achievable temperatures, the gases can liquefy and exist as liquids. This principle is used to liquefy oxygen, hydrogen, helium, nitrogen, and petroleum gas too. The LPG cylinder contains liquefied petroleum gas at high pressure.

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Either decrease temperature or increase pressure this can suffice your need.
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We can liquify atmospheric gases under high pressure and low temperature conditions.
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