How To Read A Phase Diagram

This is the phase diagram for a typical pure substance. Where the phases are.

General Phase Diagrams Chemistry For Non Majors

A phase diagram helps show what phase exist at what temperature and pressure.

How to read a phase diagram. What you need to know. Boiling points melting points and sublimation points vary with pressure. So how do you read a phase diagram.

This is the most common form that you might see in your chemistry class or on some standardized test but what it captures is the different states of matter and when they transition according to temperature and pressure. In the cases well be looking at on this page the phases will simply be the solid liquid or vapour gas states of a pure substance. Point b in this phase diagram represents the only combination of temperature and pressure at which a pure substance can exist simultaneously as a solid a liquid and a gas.

Let me write that down. And there are many forms of phase diagrams. This is the phase diagram for water.

A phase diagram lets you work out exactly what phases are present at any given temperature and pressure. This phase diagram phase diagram shows a typical binary system that happens to contain a eutectic. It is therefore called the triple point of the substance and it represents the only point in the phase diagram in which all three states are in equilibrium.

How to read a phase diagrams everybody remembers that the boiling point of water is 100c but thats only true at a certain pressure 1 bar. Phase diagrams can be used to understand the range of thermodynamic variables over which a pure sample of matter exists as a particular statephase. Phase diagrams are divided into three single phase regions that cover the pressure temperature space over which the matter being evaluated exists.

Liquid gaseous and solid states. This is a fairly common characteristic of bimetallic alloys the copper silver system for instance has a phase diagram very similar to the one in the link.

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