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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:

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

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

  
  
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  Commonly used in engineering, manufacturing, and medicine

  
  

Decimeter and Square Decimeter – A Short Note

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

1 decimeter = 10⁻¹ meters (0.1 meters)

Decimeters are used to measure lengths that are larger than centimeters but smaller than a meter, such as the size of a small box or the length of a hand.

A square decimeter (symbol: dm²) is a unit of area representing a square with sides one decimeter long:

1 dm² = (0.1 m) × (0.1 m) = 0.01 m²

Square decimeters are commonly used to measure medium-sized surface areas, such as the area of a notebook page, a tile, or a small tabletop.

In summary:

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  Decimeter (dm) measures moderate lengths

  
  
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  Square decimeter (dm²) measures moderate areas

  
  
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  Used in everyday measurements, education, and practical applications