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Long Reed


The long reed is an old English unit of length used primarily in measuring land, especially in agriculture and surveying. It is traditionally equal to 16.5 feet or 5.03 meters.


The long reed was used alongside other units like the rod, pole, and perch, often interchangeably, to measure distances and plot boundaries.


Key points:



  • 1 long reed = 16.5 feet ≈ 5.03 meters



  • Used historically in land measurement and agriculture



  • Equivalent or similar to the rod, pole, or perch



  • Important in English customary measurement systems



Though obsolete now, the long reed is part of the rich history of traditional English measurement units.



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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