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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.


Millimeter and Square Millimeter – A Short Note


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


1 millimeter = 10⁻³ meters (0.001 meters)


Millimeters are commonly used to measure small lengths and thicknesses in everyday life, such as the diameter of a pencil, the thickness of paper, or small machine parts.


A square millimeter (symbol: mm²) is a unit of area representing a square with sides one millimeter long:


1 mm² = (10⁻³ m) × (10⁻³ m) = 10⁻⁶ m²


Square millimeters are often used to measure surface areas in small objects, like the cross-sectional area of wires, small patches of skin, or the surface of tiny electronic components.


In summary:



  • Millimeter (mm) measures small lengths in daily life and engineering



  • Square millimeter (mm²) measures small areas on a scale larger than microscopic but still quite small



  • Commonly used in engineering, manufacturing, and medicine




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