speed of light

USAGE SUMMARY

The phrase "speed of light" is correct and usable in written English.
You can use it when referring to the velocity of light, which is a physical constant equal to 299,792,458 meters per second. For example: "The speed of light is incredibly fast—about 186,000 miles per second!".

✓ Grammatically correct

Science

News & Media

Encyclopedias

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

About the speed of light.

The New Yorker

Here, c is the speed of light.

Encyclopedia Britannica

Nostalgia moves at the speed of light.

The Guardian - Books

"They process trends at the speed of light," she said.

The New York Times - Style

"The speed of light, the date of the moon landing.

The New Yorker

What does this mean for the speed of light?

The Guardian

"Magnetism, deep space, or the speed of light, fragmentation . . .

The New Yorker

Instead, the speed of light is "the one true standard".

The New York Times - Books

Please fly here at the speed of light".

The New Yorker

Re "Particles Faster Than the Speed of Light?

The New York Times - Science

Because everybody knows that the speed of light is constant.

Independent

Expert writing Tips

Best practice

When discussing scientific contexts, ensure you use "speed of light" to refer to the precise physical constant (299,792,458 meters per second). In metaphorical contexts, use it to indicate something very fast or instantaneous.

Common error

Avoid using "speed of light" loosely to describe processes that are merely fast. Reserve it for situations where the speed or transmission is nearly instantaneous or exceptionally rapid to maintain impact and accuracy.

Linguistic Context

The phrase "speed of light" functions primarily as a noun phrase. It refers to a fundamental physical constant, specifically the speed at which electromagnetic radiation travels in a vacuum. Ludwig AI confirms that it is correct and usable in written English.

Expression frequency: Very common

Frequent in

Science

40%

News & Media

35%

Encyclopedias

10%

Less common in

Wiki

8%

Formal & Business

5%

Reference

2%

Ludwig's WRAP-UP

The phrase "speed of light" is a noun phrase referring to the velocity of electromagnetic radiation in a vacuum, a fundamental physical constant. Ludwig AI confirms its correctness and usability. While predominantly used in scientific contexts, it also frequently appears in news and media, sometimes metaphorically to describe extreme speed. When used in its technical sense, the register is formal and scientific; in broader contexts, it maintains a professional tone. Remember to use the term precisely in scientific discussions and carefully when employing it metaphorically.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

Light's velocity

Focuses on a more concise and technical term for the same concept.

Celerity of light

Uses a less common but synonymous term for speed, adding a touch of formality.

Light propagation speed

More specifically describes the action of light propagating.

Rate of photon propagation

Emphasizes the propagation of photons, the particles of light.

Limit of cosmic velocity

Highlights the role of the speed of light as a cosmic speed limit.

The constant c

Uses the shorthand notation commonly used in physics.

Einstein's constant

Refers to the speed of light in the context of Einstein's theory of relativity.

Maximum electromagnetic radiation speed

Specifies the type of radiation and emphasizes the maximum speed.

Light's pace

Offers a simpler, less technical term.

How fast light travels

Presents the concept in a question format, useful for explanatory contexts.

FAQs

How is "speed of light" used in physics?

In physics, "speed of light" refers to the velocity of electromagnetic radiation in a vacuum, a fundamental constant denoted as 'c'. It's a key component in many physical equations, including Einstein's mass-energy equivalence, E=mc².

What's a common metaphor using "speed of light"?

Metaphorically, "speed of light" is used to describe anything that happens extremely quickly or instantaneously. For example, "News travels at the "speed of light" on social media".

Is it correct to say something is 'faster than the speed of light'?

According to current physics, nothing can travel faster than the "speed of light" in a vacuum. Claims of faster-than-light travel often challenge established scientific principles.

What are some alternative phrases for expressing the concept of "speed of light"?

Depending on the context, you can use phrases like "light's velocity", "celerity of light", or simply refer to it as '"the constant c"' in technical discussions.