Length is the physical quantity that indicates the length of a body or figure. Mass is the physical quantity that indicates the amount of matter that a body has. Time is the physical magnitude that indicates the length of the phenomena (objectives). But phenomena are irreversible successions of changes that go from a beginning to an end (interval), so that time increases continuously. We visualize time through its measurements.
One of the great achievements of Physics was to measure an imperceptible (magnitive) magnitude. This was made possible by natural (objective) periodic phenomena. These phenomena are the means by which the existence of time is proven. The clock represents the rotation cycle of the Earth.
You have to learn to think about magnitude time: objective, imperceptible (intervals) and measurable (duration). Time is not only imperceptible, it is unobservable by mathematical equations.
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