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Inch and Square Inch 

An inch is a unit of length commonly used in the United States and other countries following the imperial system. It is equal to 1/12 of a foot or approximately 2.54 centimeters. Inches are typically used to measure small distances or dimensions, such as the size of a screen or the height of an object.

A square inch (written as in²) is a unit of area that represents a square with sides that are one inch in length. It is used to measure surface area, such as the area of a piece of paper, a screen, or a section of flooring. One square inch equals 6.45 square centimeters.

While inches measure one-dimensional length, square inches measure two-dimensional area. Understanding the difference between the two is important in fields such as construction, design, and manufacturing where both length and area are frequently calculated.

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