Definition

A substance made from lichens that changes color in response to acidity or basicity, commonly used to test the pH level of a solution.

Example

The scientist used litmus paper to determine if the solution was acidic or basic.

Conversation

Have you ever used litmus paper in science class?

Yeah, I remember it changes color based on the acidity of a solution.

Right! It’s such a simple way to test pH levels with litmus paper.

Exactly, it makes understanding acids and bases a lot easier.

Synonyms & Antonyms

Root Explanation

Litmus originates from the Old Norse word 'litmoss', where 'lit' means color and 'moss' refers to a type of lichen. The term describes a colored lichen used to test acidity or alkalinity in solutions.

Memory Tip

Think of 'lit' meaning color and 'moss' as a natural substance — this helps you remember that litmus is a color-changing substance used in tests.

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