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Light Year


A light year is a unit of distance used in astronomy to measure how far light travels in one year. Light moves extremely fast—about 299,792 kilometers per second—so in one year, it travels roughly 9.46 trillion kilometers (or about 5.88 trillion miles). Light years help scientists express the huge distances between stars and galaxies. For example, the nearest star to Earth, Proxima Centauri, is about 4.24 light years away. The term “light year” can be confusing because it sounds like a measure of time, but it actually measures distance.


Microinch


A microinch is a very small unit of length used primarily in precision engineering and manufacturing. It equals one-millionth of an inch (0.000001 inch), which is approximately 0.0254 micrometers (µm).


Microinches are used to measure extremely fine tolerances, surface finishes, and thicknesses in high-precision machining, electronics, and materials science.


Key facts:



  • 1 microinch = 0.000001 inch



  • 1 microinch ≈ 0.0254 micrometers (µm)



  • Used in precision engineering for very small measurements



  • Allows for accurate description of surface roughness and thickness



The microinch is essential in fields requiring ultra-fine measurements where standard units like the inch or millimeter are too large.




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