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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:
Millimeter (mm) measures small lengths in daily life and engineering
Square millimeter (mm²) measures small areas on a scale larger than microscopic but still quite small
Commonly used in engineering, manufacturing, and medicine
Kilometer and Square Kilometer – A Short Note
A kilometer (symbol: km) is a unit of length in the metric system, equal to:
1 kilometer = 1,000 meters
Kilometers are commonly used to measure long distances, such as the length between cities, the distance traveled by vehicles, or the size of large geographical features.
A square kilometer (symbol: km²) is a unit of area representing a square that is one kilometer long on each side:
1 km² = (1,000 m) × (1,000 m) = 1,000,000 m²
Square kilometers are widely used to measure large surface areas, like the size of cities, countries, forests, or lakes.
In summary:
Kilometer (km) measures long lengths or distances
Square kilometer (km²) measures large areas
Commonly used in geography, travel, and land measurement