kilometers per hour
Definition
Noun A unit of speed expressing the number of kilometers traveled in one hour. It is a measure of velocity, calculated as the ratio of distance (in kilometers) to time (in hours).
Usage
This term is used to specify the speed of a moving object, such as a vehicle. It is commonly abbreviated as km/h or kph.
Examples
- The speed limit on this highway is 100 kilometers per hour.
- The storm winds were recorded at 120 kilometers per hour.
- The new train has a maximum speed of 300 kilometers per hour.
Advanced Usage
- Scientific and Technical Contexts: While 'kilometers per hour' is standard for everyday use (e.g., road signs, weather reports), scientific contexts often use meters per second (m/s). The conversion is: 1 km/h ≈ 0.2778 m/s.
- Comparative Speed: The term is often used in comparisons.
- The cheetah can run nearly twice as fast, reaching speeds of over 100 kilometers per hour.
Variants and Related Words
- km/h: The standard international abbreviation.
- kph: A common alternative abbreviation, especially in some English-speaking countries.
- Miles per hour (mph): The imperial unit equivalent for speed. 1 mph is approximately 1.609 km/h.
Synonyms
- Speed: The general concept of distance traveled per unit of time.
- Velocity: In everyday language, often used interchangeably with speed, though in physics it is a vector quantity (speed with direction).
Related Phrases
- ...per hour: A phrase pattern used to form other rates (e.g., , ).
- Average speed: The total distance traveled divided by the total time taken, often expressed in kilometers per hour.
Noun
-
the ratio of the distance traveled (in kilometers) to the time spent traveling (in hours)
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