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Picometer and Square Picometer – A Short Note

A picometer (symbol: pm) is a metric unit of length equal to:

1 picometer = 10⁻¹² meters

It is used to measure extremely small distances, typically at the atomic and molecular scale. For example, the diameter of a hydrogen atom is about 50–120 picometers. Scientists use picometers in fields like chemistry, nanotechnology, and physics to describe the size of atoms, chemical bonds, and tiny structures.

A square picometer (symbol: pm²) is a unit of area, representing a square with each side one picometer long:

1 pm² = (10⁻¹² m) × (10⁻¹² m) = 10⁻²⁴ m²

This unit is used to express extremely small surface areas, such as the cross-sectional area of atoms or molecules.

In summary:

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  Picometer (pm) measures ultra-small lengths

  
  
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  Square picometer (pm²) measures extremely small areas

  
  
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  Common in nanoscience, chemistry, and quantum physics

  
  

Yard and Square Yard – A Short Note

A yard is a unit of length used in the imperial and U.S. customary systems. One yard equals 3 feet or 36 inches, which is approximately 0.9144 meters. Yards are commonly used to measure longer lengths or distances, such as in sports fields, fabric measurements, or landscaping.

A square yard (written as yd²) is a unit of area. It represents the area of a square that is one yard (3 feet) on each side. One square yard equals 9 square feet or 1,296 square inches, and approximately 0.836 square meters. Square yards are often used to measure surfaces like carpeting, lawns, or large fabric areas.

In short, a yard measures how long something is, while a square yard measures how much surface area it covers. Understanding both is useful in construction, gardening, and textile industries.