![]() In thermodynamics, time has the additional property of being directed. The concept of time used in Newtonian physics is one-dimensional, metrical, external, spatially global, temporally global, unique, but it is not directed and it does not have a present. In the natural language, when we use the concept of time we generally assume that time is one-dimensional, metrical, external, spatially global, temporally global, unique, directed, that it implies a present, and that it allows memory and expectations. Namely, the possibility of distinguishing the past direction from the future direction ĭ) The existence of a preferred time instant, namely the present, the “now”. We denote this possibility as metricity of time.Ĭ) The existence of an ordering relation between time instants. Namely the possibility of stating that two distinct time intervals are equal in magnitude. These are the following:Ī) The existence of a topology on the set of the time instants, namely the existence of a notion of two time instants being close to each other, and the characteristic “one dimensionality” of time ī) The existence of a metric. The structure of R corresponds to an ensemble of attributes that we naturally associate to the notion of time. Time is frequently represented by a variable t in R. The real line is a traditional metaphor for the idea of time. … our aim is to emphasize the general fact that a single, pure and sacred notion of “Time” does not exist in physics. ![]() ![]() We propose a general terminology to express these differences. We find ten distinct versions of the concept of time, all used in the natural sciences, characterized by different properties, or attributes, ascribed to time. Carlo Rovelli’s “Analysis of the Distinct Meanings of the Notion of “Time” in Different Physical Theories” ( Il Nuovo Cimento B, Jan 1995, Vol 110, No 1, pp 81–93) describes ten distinct versions of the concept of time, which he arranges hierarchically. ![]()
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