| 借鉴/启示/前瞻/趋势 | 演讲全文 | 著名签名档 | 思考平台 | 全排行榜 | 求同存异 | 现象/性质/特征/效应 | 名言名句 | 打破惯例/改变认识/观念更新 |
您当前的位置:首页 > 启迪思维 > 思考平台

The continuity equation

时间:2010-07-01 10:30:41  来源:  作者:

A continuity equation in physics is a differential equation that describes the transport of some kind of conserved quantity. Since mass, energy, momentum, electric charge and other natural quantities are conserved, a vast variety of physics may be described with continuity equations.
Continuity equations are the (stronger) local form of conservation laws. All the examples of continuity equations below express the same idea, which is roughly that: the total amount (of the conserved quantity) inside any region can only change by the amount that passes in or out of the region through the boundary. A conserved quantity cannot increase or decrease, it can only move from place to place.
Any continuity equation can be expressed in an "integral form" (in terms of a flux integral), which applies to any finite region, or in a "differential form" (in terms of the divergence operator) which applies at a point. In this article, only the "differential form" versions will be given; see the article divergence theorem for how to express any of these laws in "integral form".

 

来顶一下
返回首页
返回首页
发表评论 共有条评论
用户名: 密码:
验证码: 匿名发表
推荐资讯
相关文章
栏目更新
栏目热门