Can the pressure of liquid air/gas can be increased?

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The pressure of liquid air or gas can be increased mechanically by either adding more fluid to a fixed-volume container or by reducing the container's size with a fixed mass of fluid. This can be achieved using high-static-pressure pumps for continuous flow or piston-cylinder systems for compressing the fluid. Cryogenic pumps are suitable for handling fluids at low temperatures, although the discussion raises concerns about machinery performance at these temperatures. It is clarified that liquid water does not represent a very low temperature, suggesting that the focus should be on specific cryogenic applications. Understanding the practical machinery options is essential for effectively increasing the pressure of liquid air or gas.
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I want to know whether like liquid water or other liquids available at normal temperature and pressure, can the pressure of liquid air/gas be increased mechanically? If yes, then what kind of machinery can do the job? I am asking the question here not on the theoretical part, but on the practical aspect.
 
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Options are to increase the mass of fluid within a fixed container, or to decrease the size of a container with a fixed mass of fluid. Either would increase the pressure of the fluid.

Practically speaking, this means you can either:
  • Pump the fluid into a fixed volume container, the more fluid you pump in the higher the pressure (requires a high-static-pressure pump). This might be the more common method because it can support continuous flow.
  • Compress the fluid in a container which can change size, like for example a piston-cylinder combination.
 
I can understand the principle. But, problem is what kind of machinery can perform at such low temperature.
 
pranj5 said:
I can understand the principle. But, problem is what kind of machinery can perform at such low temperature.
What low temperature? Liquid water is not a very low temperature.
 

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