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单词 Perpetual motion machine of the first kind
释义

Perpetual motion machine of the first kind

中文百科

永动机 Perpetual motion

(重定向自Perpetual motion machine of the first kind)
魔轮:右侧重垂在重力作用下远离转动轴,力矩随之增大,驱动魔轮转动,但由于左侧重垂数量更多,平衡了系统力矩,永动无法实现
Un
Móvil perpetuo de Villard de Honnecourt, ca. 1230.
Frasco de autollenado de Robert Boyle.

永动机是一类所谓不需外界输入能源、能量或在仅有一个热源的条件下便能够不断运动并且对外做功的机械。历史上人们曾经热衷于研制各种类型的永动机,其中包括达芬奇、焦耳这样的学术大师。在热力学体系创建后,学界认定永动机相悖于热力学基本原理的设想,而将之从正统学术界中排除。然而永动机的研究者始终未曾间断。从一个侧面也可以认为,人类对永动机的热情以及制造永动机的种种实践,推动了热力学体系的创建和机械制造技术的进步。

1775年法国科学院通过决议,宣布永不接受永动机,现在美国专利及商标局严禁将专利证书授予永动机类申请。

英语百科

Perpetual motion 永动机

(重定向自Perpetual motion machine of the first kind)
Robert Fludd's 1618
October 1920 issue of Popular Science magazine, on perpetual motion. Although scientists have established them to be impossible under the laws of physics, perpetual motion continues to capture the imagination of inventors. The device shown is a
Perpetuum Mobile of Villard de Honnecourt (about 1230).
The

Perpetual motion is motion of bodies that continues indefinitely. This is impossible because of friction and other energy-dissipating processes. A perpetual motion machine is a hypothetical machine that can do work indefinitely without an energy source. This kind of machine is impossible, as it would violate the first or second law of thermodynamics.

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更新时间:2025/6/18 2:12:16