不变损耗(或固定损耗)。这种损耗的大小与负荷电流的变化无关，与电压变化有关，而系统电压是相对稳定的，所以其损耗相对不变。如变压器、互感器、电动机、电能表等铁芯的电能损耗，以及高压线路的电晕损耗、绝缘子损耗等。
单个粒子的动量,会发生改变，但是总动量不变,而动能被损耗。
The momentum of the individual particles gets changed, but the net momentum did not change but the kinetic energy was destroyed.
随着烧结条件的不同，介电常数几乎不变，但介电损耗以及介电常数的温度系数则较为敏感。
The dielectric constant was almost a constant, while the dielectric loss and temperature coefficient of dielectric constant were sensitive to the sintering conditions.
此光纤经紫外辐照后吸收峰处损耗明显增加，而低损耗区损耗几乎不变。
After ultraviolet irradiation, the fiber attenuation increases obviously at several absorption peaks, whereas the value in low absorption region remains almost no change.
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