A litmus test is a term that originates from chemistry and is used to describe a test that determines the acidity or alkalinity of a solution using litmus paper
Chemical Context
- Definition: A litmus test in chemistry is a simple test to determine whether a solution is acidic or basic. It uses litmus paper, which changes color based on the pH of the solution.
- Process: When litmus paper is dipped into a solution, it turns red if the solution is acidic and blue if it is basic.
Metaphorical Usage
- General Meaning: In a metaphorical sense, a litmus test is a crucial and revealing test where a single factor is decisive. It is used to make a judgment about whether something or someone is acceptable.
- Examples:
- In politics, a litmus test might be a question asked of a potential candidate for high office, the answer to which would determine whether the nominating official would proceed with the appointment or nomination.
- In other contexts, it can refer to any situation or event that serves as a critical indicator of success or failure.
Usage in Sentences
- Example 1: "The election results will serve as a litmus test for the popularity of the government’s new policies for the people."
- Example 2: "My daughter’s first professional match will be a litmus test of her training and abilities."
- Example 3: "Public reaction to this new movie will be a litmus test for the whole genre."
Synonyms and Related Terms
- Synonyms: Decisive test, crucial test, defining moment, acid test.
- Related Terms: Acid test, which is similar but often used to describe a conclusive test of quality or authenticity.
Origin and Etymology
- The term "litmus test" comes from the chemical test using litmus paper, which has been used since the 19th century. The metaphorical use of the term began in the mid-20th century, particularly in American politics.
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