What is time?
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Time in physics is defined by its measurement: time is what a clock reads. In classical, non-relativistic physics, it is a scalar quantity (often denoted by the symbol. ) and, like length, mass, and charge, is usually described as a fundamental quantity.
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Time is a measure of non-stop, consistent change in our surroundings, usually from a specific viewpoint.
While the concept of time is self-evident and intuitive – the steady passing of events before our eyes; the orbit of the Moon around our planet – describing its fundamental nature is much harder.
Even physicists aren't sure what actually happens when time passes. Although they do have a few hypotheses.
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