constant
A number all by itself
A constant is a value or quantity that does not change during a particular mathematical or scientific process. Constants are important in mathematics, physics, and engineering because they help us understand how a particular system or process behaves. In mathematics, a constant can also refer to a fixed term or number that appears in an equation or formula.
Examples of constants include the speed of light in a vacuum, which is approximately 299,792,458 meters per second (m/s); the gravitational constant, which is approximately 6.67430 × 10^-11 N(m/kg)^2; and pi (π), which is a mathematical constant that represents the ratio of the circumference of a circle to its diameter and is approximately equal to 3.14159.
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