## Introduction

The critical pressure of a substance is the pressure corresponding to the critical point (or the critical state) of the substance.

The critical point of a substance can be defined as the point on the temperature and pressure scale in which a liquid substance can coexist with its vapour.

## According to wikipedia…

In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve.

I would like to analyse the following topics:

• Critical pressure definition
• What is critical pressure and temperature
• Critical pressure ratio
• Critical pressure formula
• Critical pressure ratio for steam
• How to calculate critical pressure
• How to calculate pseudo critical pressure and temperature

## Critical pressure definition

Critical pressure (According to 2 sources).

For a pure substance, the critical pressure is defined as the pressure above which liquid and gas cannot coexist at any temperature.

The critical temperature for a pure substance is the temperature above which the gas cannot become liquid, regardless of the applied pressure.

## What is Critical Pressure And Temperature

Critical pressure and temperature are defined as the pressure and temperature at the critical point.

For a gas mixture, the critical point is defined as the point (pressure and temperature) at which all properties of the liquid and the gas become identical.

## Critical pressure ratio

The Critical pressure ratio indicates the pressure ratio after which mass flow rate cannot be increased further even if exit pressure is reduced.

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## Video: Critical Properties of a Fluid (T and...

If you are a visual or audio person, have a look at this related Youtube video:

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## Citation

When you need to include a fact or piece of information in an assignment or essay you should also include where and how you found that piece of information (Critical Pressure).

That gives credibility to your paper and it is sometimes required in higher education.

To make your life (and citation) easier just copy and paste the information below into your assignment or essay:

Luz, Gelson. Critical Pressure. Materials Blog. Gelsonluz.com. dd mmmm. yyyy. URL.

Now replace dd, mmmm and yyyy with the day, month, and year you browsed this page. Also replace URL for the actual url of this page. This citation format is based on MLA.

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