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Kilometer and Square Kilometer – A Short Note


A kilometer (symbol: km) is a unit of length in the metric system, equal to:


1 kilometer = 1,000 meters


Kilometers are commonly used to measure long distances, such as the length between cities, the distance traveled by vehicles, or the size of large geographical features.


A square kilometer (symbol: km²) is a unit of area representing a square that is one kilometer long on each side:


1 km² = (1,000 m) × (1,000 m) = 1,000,000 m²


Square kilometers are widely used to measure large surface areas, like the size of cities, countries, forests, or lakes.


In summary:



  • Kilometer (km) measures long lengths or distances



  • Square kilometer (km²) measures large areas



  • Commonly used in geography, travel, and land measurement



Revolutions per Second (r/s)


Revolutions per second (r/s) is a unit of angular velocity that measures how many complete rotations or revolutions an object makes in one second. One revolution corresponds to a full 360-degree turn or 2π2\pi radians. This unit is commonly used to describe very fast rotational speeds in machinery, motors, turbines, and other high-speed rotating systems. For example, a motor spinning at 50 r/s completes 50 full rotations every second. Revolutions per second provide a clear and precise measure of rapid rotational motion, useful in physics, engineering, and technology fields where high-speed rotation is involved. It also facilitates easy conversion to other angular velocity units like radians per second or revolutions per minute.



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