Millimeter (mm)

Definition

The millimeter (mm) is a unit of length in the International System of Units (SI), defined as one-thousandth of a meter. In exact terms, 1 mm = 0.001 m.

History

The millimeter has its roots in the metric system, established in France in the late 18th century. The meter was defined in 1791 based on a fraction of the Earth's meridian. The millimeter was subsequently defined as one-thousandth of this meter, gaining global acceptance in the 19th century.

Uses

Millimeters are widely used in various fields, including engineering, manufacturing, and everyday measurements. Common applications include measuring the dimensions of small objects, precision engineering, and in specifications for products like screws and bolts. The millimeter is standard in countries using the metric system.

Conversions

  • 1 mm = 0.1 cm
  • 1 mm = 0.001 m
  • 1 inch = 25.4 mm (exact)

Fun Facts

  • Many people confuse millimeters with centimeters, often underestimating the small size of a millimeter.
  • The millimeter is commonly used in the automotive industry for precise measurements of components.
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