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Foot and Square Foot – A Short Note

A foot is a unit of length in the imperial and U.S. customary systems. One foot is equal to 12 inches or approximately 30.48 centimeters. It is commonly used to measure height, length, or distance—such as a person's height, the length of a room, or the size of an object.

A square foot (written as ft²) is a unit of area. It represents a square that is one foot long and one foot wide. One square foot is equal to 144 square inches or approximately 0.093 square meters. It is widely used in real estate, architecture, and construction to measure floor space, land area, or surface coverage.

In simple terms, a foot measures how long something is, while a square foot measures how much space it covers. Knowing the difference is essential when dealing with both length and area in everyday tasks or professional work.

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