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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.
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.
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noun. the 19th letter of the Greek alphabet (T, τ ). the consonant sound represented by this letter. tav. Also tau·on []. Physics. tau lepton. Also called tau pro tein. Biochemistry. a protein that is an important component of nerve cells, helping to maintain their function and structure: in the brain, distortions in the protein’s molecular ...
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
