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An interpretation of the inertial mass increase due to an object's velocitywhich is derived from the theory of special relativity is discussed. A Lorentztransformation of the reference time causes the inertial mass increase. It isassumed that the real physical phenomenon that occurs is an expansion of thereference time by a Lorentz transformation (that is, a dilation of time). Onlythe reference time is assumed to be variant, which causes relativistic mass.Time dilation is real. Relativistic mass originates in a Lorentz transformationof reference time.

Interpretation of relativistic, transverse, and longitudinal mass using  the Lorentz transformation of reference time: Explanation of time dilation  via spherical light clock