τ (EN)

字母，符号

字母 “τ”

1. 希腊字母表的第十九个字母
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   In the Greek word for "life," the letter τ is used to represent the "t" sound.

符号 “τ”

1. （在物理学中）力矩，是一种使物体旋转的力的度量。
   The engineer calculated the torque τ needed to turn the gear mechanism.
2. （在物理学中）剪应力，即导致层间相互滑动的力与面积之比。
   The material's deformation was analyzed by applying the shear stress τ.
3. （在数学中）一个常数，等于6.283，表示圆的周长与其半径的比值。
   By using τ instead of 2π, the formula for a circle's circumference becomes simpler.
4. （在物理学中）光学深度，是衡量介质对辐射不透明程度的一个指标。
   Scientists measured the optical depth τ to understand the atmosphere's effect on starlight.
5. （在物理学中）τ粒子，一种类似于电子但质量更大的基本粒子。
   The researchers observed the decay of the tau lepton τ in their experiments.
6. （在语音学中）表示清齿塞音的符号
   In some phonetic scripts, τ denotes the dental 't' sound found in certain languages.
7. （在语音学中）表示浊冠状吸气音辅音的符号。
   Linguists use τ to represent specific click sounds in the study of African languages.