Beginner Topic 253 of 1102 States of Matter & Solutions
Liquid State
Particles are close together but mobile, so liquids flow and take the container's shape.
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In-depth explanation of Liquid State
The liquid state is a condensed phase in which particles are almost as close together as in a solid but are disordered and free to move past one another. Because the particles are close, liquids are nearly incompressible and have a definite volume, but they take the shape of their container because the particles can flow. Liquids display properties such as surface tension and viscosity, which arise from the intermolecular forces between particles. The density of a liquid is usually much greater than that of its vapour, and the strength of the forces determines how readily the liquid evaporates. Most chemical reactions take place in the liquid state, especially in solution.
Going deeper: Liquid State
Key ideas: Liquids have number densities about 1000 times that of gases, with molecules in contact and short-range order only. Key properties follow from intermolecular forces: higher forces give higher boiling point, viscosity and surface tension. Typical compressibility is tiny, about 5 x 10^-5 per atm for water.
Common mistakes and connections: Students treat liquids as having no structure, but they have local order, and for water a hydrogen-bond network. Another error is saying liquids cannot be compressed at all; they can slightly. Liquids expand with temperature far less than gases. Links to vapour pressure, viscosity, surface tension and the solid-liquid transition.
Visualization of Liquid State
In a liquid particles stay close together but slide past each other, giving fixed volume yet no fixed shape. The interactive lesson shows this as a live animation or chart.
Worked example and use case
Water has a density of about 1.0 g/mL at room temperature, far greater than that of water vapour at the same temperature.
Frequently asked questions about Liquid State
What is Liquid State?
Particles are close together but mobile, so liquids flow and take the container's shape.
Is Liquid State a beginner, intermediate or advanced topic?
Liquid State is a beginner topic in States of Matter & Solutions. It needs no earlier chemistry lessons and is a good starting point.
What should I learn before Liquid State?
Study these earlier topics in States of Matter & Solutions first: Critical Temperature, Joule-Thomson Effect, Liquefaction of Gases.
What comes after Liquid State?
The next topics in States of Matter & Solutions are Vapor Pressure and Evaporation.
Can I practise Liquid State with quizzes?
Yes. The interactive lesson includes a self-check question on Liquid State, and the States of Matter & Solutions quiz draws on every topic in this area.
Where Liquid State fits in States of Matter & Solutions
Liquid State is topic 34 of 109 in States of Matter & Solutions.