Time: Difference between revisions - Wikipedia

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[[File:Wooden hourglass 3.jpg|thumb|200px|right|The flow of [[sand]] in an [[hourglass]] can be used to keep track of elapsed time. It also concretely represents the [[present]] as being between the [[past]] and the [[future]].]]

[[File:Pocket watch with chain.jpg|thumb|200px||right|[[Pocket watch]]es are used to keep track of time.]]

'''Time''' is a [[Time in physics|physical paradigm]]{{vague|date=July 2010|reason=like boiling or fusion? reason2=This is also an Easter egg which goes to an article that does NOT even discuss time as a process. An expected link might be to [[Process (science)]] but that article does not help make this vague statement any clearer either. This is simply somebody's OR}}

'''Time''' is a continuum that runs from the past, through the present, and into the future. Within this continuum events occur one after the other and these events cannot be reversed. In light of this, time is an expression of an interval between two points, each marked by an event which lasts a duration (of time). Hence time is measured, as with years, days, minutes, seconds, or fractions of a second. Furthermore, time can be viewed as system containing measured intervals. <ref name=AHD>*{{cite web |url=http://www.yourdictionary.com/time |title=The American Heritage® Dictionary of the English Language |edition=4th |year=2010 |quote=

and non-spatial [[dimension]] in which [[reality]] is macroscopically transformed in [[Continuum (theory)|continuity]] from the [[past]] through the [[present]] and on to the [[future]].

<ref name=AHD>*{{cite web |url=http://www.yourdictionary.com/time |title=The American Heritage® Dictionary of the English Language |edition=4th |year=2010 |quote=

1a. A nonspatial continuum in which events occur in apparently irreversible succession from the past through the present to the future.

1b. An interval separating two points on this continuum; a duration: a long time since the last war; passed the time reading.

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1e. A system by which such intervals are measured or such numbers are reckoned: solar time....

11. The rate of speed of a measured activity: marching in double time.}}).

</ref>{{failed verification|date=July 2010|reason=much of this, the part Stevertigo sourced to "moi" (himself) is VERY CLEARLY NOT in citation}}

</ref>

Time has been defined as a one-dimensional [[quantity]]<ref name=quantity>

*{{cite web |url=http://www.iep.utm.edu/time/ |title=Internet Encyclopedia of Philosophy |year=2010 |quote=Time is what clocks measure. We use time to place events in sequence one after the other, and we use time to compare how long events last.... Among philosophers of physics, the most popular short answer to the question "What is physical time?" is that it is not a substance or object but rather a special system of relations among instantaneous events. This working definition is offered by Adolf Grünbaum who applies the contemporary mathematical theory of continuity to physical processes, and he says time is a linear continuum of instants and is a distinguished one-dimensional sub-space of four-dimensional spacetime.}}