[chemical engineering] Space time (or space-time) is the time necessary to process one reactor volume of fluid, given a particular set of entrance conditions. Commonly represented by the Greek letter τ, it is obtained by dividing the reactor volume by the volumetric flow rate entering the reactor. It is the equivalent to the hydraulic rete...
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http://en.wikipedia.org/wiki/Space_time_(chemical_engineering)

A conception arising from the relativity theory in which the former ideas of the independence of three-dimensional space and one-dimensional space-time continuum.
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http://jot101.com/2015/05/a-z-of-science-fiction-words/

in physical science, single concept that recognizes the union of space and time, posited by Albert Einstein in the theories of relativity (1905, ... [12 related articles]
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http://www.britannica.com/eb/a-z/s/134

conceptual model having properties of a four-dimensional mathematical space and used to describe everything existing physically
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=111-16-01

See Special Relativity.
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http://www.encyclo.co.uk/local/21425

[
n] - the 4-dimensional coordinate system (3 dimensions of space and 1 of time) in which physical events are located
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http://www.webdictionary.co.uk/definition.php?query=space-time
space-time continuum noun the four-dimensional coordinate system (3 dimensions of space and 1 of time) in which physical events are located
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https://www.encyclo.co.uk/local/20974

The four-dimensional continuum including the three dimensions of space (length, width and height) and one of time; the unity of space and time. The concept was first suggested by H. Minkowski and immediately afterward incorporated by A. Einstein into his (special) theory of relativity. The former contended that nothing can exist or be conceived of....
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https://www.encyclo.co.uk/local/21203

In physics, combination of space and time used in the theory of relativity. When developing relativity, Albert Einstein showed that time was in many respects like an extra dimension (or direction) to space. Space and time can thus be considered as entwined into a single entity, rather than two separate things. Space-time is considered to have f...
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https://www.encyclo.co.uk/local/21221
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