yes, light has a mass that is what Albert Einstein said.
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the measurement of energy mass speed of light
Energy equals mass multiplied by the speed of light squared
Remember: E=mc2 = Energy equals mass multiplied by the speed of light squared. It depends on the mass. eg. mass: 50. 50x90000000000=4500000000000 50 units of mass multiplied by the speed of light squared (90000000000) equals 4500000000000 units of energy. If the mass is different, you would get different results. It all depends on the mass.
'e' = the energy equivalent of a sample of mass 'm' = the mass of the sample of mass 'c' = the speed of light
It is not a variable. The equation says that the energy contained in any given mass is equivalent to the mass times the velocity of light squared.