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Nanometer and Square Nanometer – A Short Note

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

1 nanometer = 10⁻⁹ meters

Nanometers are widely used to measure things at the molecular and atomic scale, such as the size of molecules, wavelengths of light, and features in nanotechnology. For example, the diameter of a DNA molecule is about 2 nanometers.

A square nanometer (symbol: nm²) is a unit of area, representing a square with each side one nanometer long:

1 nm² = (10⁻⁹ m) × (10⁻⁹ m) = 10⁻¹⁸ m²

Square nanometers are used to describe very small surface areas, such as the surface of nanoparticles or thin films.

In summary:

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  Nanometer (nm) measures very small lengths at the nanoscale

  
  
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  Square nanometer (nm²) measures extremely small areas

  
  
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  Common in nanotechnology, materials science, and molecular biology

  
  

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 $2\pi$ 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.