kilometers per hour

Thân thiện

The car's speedometer shows a reading of 60 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.

Học thuật

Noun

1. the ratio of the distance traveled (in kilometers) to the time spent traveling (in hours)

Từ đồng nghĩa

• kilometres per hour
• kph
• km/h