Maika Monroe
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Tau in astronomy is a measure of optical depth, or how much sunlight cannot penetrate the atmosphere; In the physical sciences, tau is sometimes used as time variable, to avoid confusing t as temperature; Time constant (also relaxation time) of any system, such as an RC circuit; Torque, the rotational force in mechanics
Learn the meaning of tau as the 19th letter of the Greek alphabet, a short-lived elementary particle, and a protein involved in neurofibrillary tangles. See examples, word history, and related articles on tau.
Learn about the Greek letter τ (tau), used in math as the circle constant and in trigonometry as a full rotation. Find out its code point, TeX, and SVG formats.
Tau is an endless string of numbers. Tau ( τ) ( / ˈtɔː, ˈtaʊ /) is a mathematical constant that is the ratio of a circle 's circumference to its radius. This produces a number, and that number is always the same. However, the number is rather strange. The number starts as 6.283185307179586 and continues without end.
Embark on an explorative journey with Tau, the 19th letter of the Greek alphabet, as we trace its origins from the Phoenician script to its pivotal role in contemporary science, technology, and culture. Discover Tau’s evolution, cultural significance, and enduring impact through the ages.
Learn about the tau, a negatively charged lepton that decays into other particles, and colloids, substances with particles in the size range of 10-7 to 10-3 cm. Find out how colloids are classified, studied, and applied in various fields.
A video that explains why tau might be a better number to use than pi to measure angles in radians. It also shows some comments from viewers who discuss the history, advantages and disadvantages of both numbers.
- 16 min
- Sal Khan
