List of constants used in physics, chemistry, mathematics, astronomy, Solar System, engineering ... etc.
More than 100 values, easy to find. A brief information of the associated concept is included, as well as different values ​​in other usual metric systems or even its expression of exact calculation for some relevant values.

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Data were obtained from reliable sources (NIST and Wikipedia).
If you think that any important value is missing, or you find any error or errata, do not hesitate to comment on it to correct it in later versions.