Properties of Liquids
Elementary School
Definition
A liquid has a fixed volume but takes the shape of its container, because its particles are close together yet able to slide past one another. This is why liquids flow and can be poured but cannot be easily compressed.
Worked examples
Pour 100 mL of water from a beaker into a graduated cylinder — the volume stays 100 mL but the shape changes.
The water takes the shape of each container because particles slide past one another while staying close together.
Push down on the plunger of a syringe filled with water (outlet blocked) — the plunger barely moves.
Liquids resist compression because their particles are already tightly packed with little space between them.
Common mistakes
- Liquids have a fixed shape because particles are close together. → Liquids have a fixed volume but take the shape of their container. Close particles give fixed volume; the ability to slide past each other allows liquids to flow and change shape.
- You can compress a liquid easily, just like a gas. → Liquids are nearly incompressible because particles are already close together. Gases compress easily because their particles are far apart; liquid particles have little room to squeeze closer.
- All liquids flow at the same rate. → Different liquids flow at different rates due to varying viscosity. Honey flows slower than water because its particles experience stronger attractions, but both still flow because particles slide.
Where you'll use it next
You'll apply liquid properties when studying density and buoyancy, solutions and mixtures, hydraulic systems in engineering, and comparing all three states of matter in chemistry and physics.
See also
Reviewed by Pat Cheng, M.Ed. — StudyPug Curriculum Lead · Last updated June 6, 2026