The second law of thermodynamics delineates an asymmetry in how physical systems evolve over time, known as the arrow of time. In macroscopic systems, this asymmetry has a clear direction (e.g., one can easily notice if a video showing a system's evolution over time is being played normally or backward).
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/2HgtWb3
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