ξ (EN)

letter, symbol

letter “ξ”

1. the 14th letter of the Greek alphabet
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   In Greek, the letter ξ is the 14th letter of the alphabet, often used in mathematics and science.

symbol “ξ”

1. (in mathematics) a variable or unknown quantity, often used in probability and statistics
   In this equation, ξ represents an unknown parameter we need to estimate.
2. (in physics) the damping ratio of an oscillating system, indicating how oscillations decay after a disturbance
   A damping ratio ξ less than one indicates an underdamped system that will oscillate.
3. (in chemical engineering) the extent of reaction, measuring how far a chemical reaction has progressed
   By measuring the change in concentration, we can calculate the extent of reaction ξ.