Gravity, the distant force interaction of mass, is an elementary part of physics. Current physics does not have any proof of gravitylike interaction between electromagnetic radiation and mass based on controlled experiments. The results presented here could be interpreted as proof of the existence of gravitylike interaction between electromagnetic radiation and mass. They suggest a notion of the indicative value of the “electromagnetic-gravity” constant. The effect manifests itself over a wide spectrum of electromagnetic radiation wavelengths, from infrared to visible. The constant has a surprisingly large value. The “gravity” effect of 1 W of electromagnetic radiation is comparable to the gravity effect of 15 kg of mass. The dependence of the interaction presented here on the wavelength... of electromagnetic radiation was not observed.