Phase Diagrams

Front

What is a phase diagram?

Back

A graphical representation showing the states of a substance (solid, liquid, gas) at different temperatures and pressures.

Front

What does the x-axis of a phase diagram typically represent?

Back

Temperature.

Front

What does the y-axis of a phase diagram typically represent?

Back

Pressure.

Front

What is the melting point?

Back

The temperature at which a solid becomes a liquid at a given pressure.

Front

What is the boiling point?

Back

The temperature at which a liquid becomes a gas at a given pressure.

Front

What is the critical point in a phase diagram?

Back

The point at which the distinction between liquid and gas phases disappears.

Front

What is the triple point?

Back

The unique set of conditions at which all three phases (solid, liquid, gas) coexist in equilibrium.

Front

What happens to a substance at temperatures above its boiling point?

Back

It exists as a gas.

Front

What happens to a substance at temperatures below its melting point?

Back

It exists as a solid.

Front

How does increasing pressure affect the melting point of a substance?

Back

Increasing pressure generally raises the melting point.