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Point


A point is a unit of length used mainly in typography to measure font size, line spacing, and other elements of printed text. It is defined as 1/72 of an inch, which is approximately 0.3528 millimeters.


Key facts:



  • 1 point = 1/72 inch ≈ 0.3528 mm



  • 12 points = 1 pica



  • Used universally in typesetting, desktop publishing, and graphic design



  • Measures font sizes, leading (line spacing), and other typographic details



The point system helps designers and printers maintain precise and consistent text layouts across various media.



Picometer


A picometer (pm) is an extremely small unit of length in the metric system, equal to one-trillionth of a meter (1 pm = 10⁻¹² meters). Picometers are used to measure things on the atomic and subatomic scale, such as the size of atoms or the distance between particles in a molecule. For example, a hydrogen atom is about 50 picometers in radius. This unit is mainly used in physics, chemistry, and nanotechnology. Because it's so small, you won’t see picometers used in everyday life — they are only relevant in scientific research where ultra-precise measurements are required.



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