光是电磁波,具有能量。早在麦克斯韦预言电磁波以前其波动性就被无数实验事实所证实,并为人们所公认。光同时具有动量,对照射物体具有压力,1899年苏联物理学家列别捷夫首先从实验上予以证实。光对物体单位面积的压力叫辐射压强或光压。光压极小,例如距一个百万烛光的光源 Light is electromagnetic waves, with energy. As far back as Maxwell’s prediction of electromagnetic wave volatility before it was confirmed by countless experimental facts, and recognized by people. Light at the same time with momentum, pressure on the irradiated objects, the Soviet physicist Lebedev in 1899 to prove it from the experiment. The pressure of light on the unit area is called the radiation pressure or light pressure. Light pressure is very small, such as from a million candlelight light source