Beginner Topic 263 of 1102 States of Matter & Solutions
Meniscus
The curved liquid surface in a tube, concave for water and convex for mercury.
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In-depth explanation of Meniscus
A meniscus is the curved upper surface of a liquid in a container, formed by the balance between cohesion within the liquid and adhesion to the container walls. For water in glass, adhesion is stronger than cohesion, so the surface curves upward at the edges and forms a concave meniscus. For mercury in glass, cohesion is stronger, so the surface curves downward and forms a convex meniscus. The shape of the meniscus affects the accuracy of volume measurements in glassware. Readings are taken from the bottom of a concave meniscus or the top of a convex one.
Going deeper: Meniscus
Key ideas: Reading rule: eye level with the surface, read the bottom of a concave meniscus, as for water in burettes and pipettes, or the top of a convex one, as for mercury. Burette readings are to 0.01 mL by estimating between 0.1 mL marks. Parallax errors give systematic over or under readings.
Common mistakes and connections: Students read the top edge of the water meniscus, or look from above, which gives an incorrect volume. Another error is thinking mercury is concave. Glassware is calibrated to specific temperatures, usually 20 C, so volumes change slightly. Connects to adhesion, cohesion, capillary action and accuracy in titration.
Visualization of Meniscus
Water forms a concave meniscus where adhesion dominates; mercury forms a convex one where cohesion dominates. Read volumes at the bottom of the curve. The interactive lesson shows this as a live animation or chart.
Worked example and use case
When reading a burette filled with water, the volume is read at the bottom of the concave meniscus with the eye level with the liquid surface.
Frequently asked questions about Meniscus
What is Meniscus?
The curved liquid surface in a tube, concave for water and convex for mercury.
Is Meniscus a beginner, intermediate or advanced topic?
Meniscus 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 Meniscus?
Study these earlier topics in States of Matter & Solutions first: Surface Tension, Capillary Action, Cohesion and Adhesion.
What comes after Meniscus?
The next topics in States of Matter & Solutions are Enthalpy of Vaporization and Enthalpy of Fusion.
Can I practise Meniscus with quizzes?
Yes. The interactive lesson includes a self-check question on Meniscus, and the States of Matter & Solutions quiz draws on every topic in this area.
Where Meniscus fits in States of Matter & Solutions
Meniscus is topic 44 of 109 in States of Matter & Solutions.