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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



Acceleration Due to Gravity


Acceleration due to gravity is the rate at which an object speeds up as it falls freely toward the Earth due to the force of gravity. It is represented by the symbol ‘g’, and its standard value on Earth is approximately 9.8 m/s². This means that for every second an object is in free fall, its velocity increases by 9.8 meters per second.


The SI unit of acceleration due to gravity is meters per second squared (m/s²). This unit expresses how quickly an object’s velocity changes while falling under the influence of gravity.


The value of g can vary slightly based on location — it is a bit lower at the equator and higher at the poles due to Earth's shape and rotation.


This concept is fundamental in understanding free fall, projectile motion, and satellite orbits, making it an essential part of physics and real-world applications.



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