density of field

基本解釋

This problem demonstrates why the energy density of gravitational field is negative.
本題演示為何重力場的能量密度是負(fù)的。
The emission current density of the field emitter is primary determined by the surface field strength of the cathode.
在計(jì)算場致發(fā)射體陰極發(fā)射電流時(shí)，影響發(fā)射電流的主要因素是陰極表面的電場強(qiáng)度。
Week 16 Energy of point charges system, energy of electric field in capacitor , energy and its density of electric field.
第16周點(diǎn)電荷系的能量；帶電電容器儲(chǔ)存的能量；電場的能量和能量密度；應(yīng)用舉例。

So, instead of having the periodic variation of water, or the periodic variation of air density here we're talking about an electric field.
不像水或者空氣密度的,周期變化，我們這里,討論的是電場。
麻省理工公開課 - 化學(xué)原理課程節(jié)選