匀速 (yún sù) — uniform velocity; constant speed

Definition

Physics term for motion at a constant speed (no acceleration). Functions as a noun or attributive modifier, as in 匀速运动 'uniform motion' or 匀速直线运动 'uniform linear motion'.

noun
uniform velocityconstant speed

Examples

  • 匀速。
    Qì chē zài gāo sù gōng lù shàng bǎo chí yún sù xíng shǐ.
    The car maintains a constant speed on the highway.
  • 匀速。
    Zhè ge shí yàn yāo qiú wù tǐ zuò yún sù zhí xiàn yùn dòng.
    This experiment requires the object to perform uniform linear motion.
  • 匀速。
    yún sù Pǎo bǐ biàn sù pǎo gèng róng yì kòng zhì hū xī.
    Running at a constant pace is easier to control breathing than variable-speed running.

Origin

Compound word
构词法gòucífǎ
偏正piānzhèngModifier + head

The first part narrows down the second: it says what kind of thing the head is.

匀yúneven
速sùspeed

匀 gives evenness and 速 gives speed, so the word means constant speed.

Characters in this word

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 勻; 匀 is its simplified writing.

Meaning part形符xíngfú
呂呂lǚtwo gold plates
Sound part声符shēngfú
螾
螾yǐn勻yún
The sound has drifted apartThe sound part was a clue two thousand years ago — it often still helps, but not always.

The traditional form 勻 meant a unit of weight. It came from a shape with 呂, two gold plates, and a part related to 螾 that gave the sound; the simplified 匀 is only a later shorthand.

Open 匀 →

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

Meaning part形符xíngfú
辵辵chuò
Sound part声符shēngfú
束
束shù速sù
Close in sound todayThe sound part was a clue two thousand years ago — it often still helps, but not always.

速 pairs 辵, the walking part, with 束, which is used for its sound; the walking part fits the meaning of moving fast.

Open 速 →

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