Euler’s Number (e)

Euler’s number, the number e, is a mathematical constant approximately equal to 2.71828. You encounter the number e in mathematics almost every day because it is the base of the natural logarithm, the limit of (1 + 1/n)n as n approaches infinity, and an expression that arises in the study of compound interest.

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Boltzmann’s Constant

The fundamental constant of physics, the Boltzmann constant, is one of the seven "defining constants" that have been given exact definitions.

Gravitational Constant (G)

The gravitational constant, G, is utterly important for any engineer. It helps determine the force between two masses.

The Speed of Light

The speed of light is a universal physical constant. It is equal to 299792458 meters per second (approximately 300000 km/s).

Avogadro’s Constant

The Avogadro constant is a number used to explain atoms, molecules, ions, and electrons. It is named after the scientist Amedeo Avogadro.

Planck’s Constant

Planck's constant is a fundamental physical constant that is utterly important in quantum mechanics. It is named after Max Planck.

The Golden Ratio (Phi)

In math, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities.

Archimedes’ Constant (Pi)

The number π is a mathematical constant, approximately equal to 3.14159. It is the ratio of a circle's circumference to its diameter.

Euler’s Identity

Euler's identity is a mathematical beauty that ties five fundamental mathematical constants in mathematics together.

Imaginary Unit (i)

The imaginary unit, i, is a solution to the quadratic equation x^2 + 1 = 0. It is called imaginary because there are not real numbers.