controlled medium

controlled medium

[kən¦trōld ′mēd·ē·əm]
(chemical engineering)
In process automatic-control work, material within a process system in which a variable (for example, concentration) is controlled.
References in periodicals archive ?
McMillan and Styris both offer controlled medium pace, which could be handy on a slow surface.
That's the big draw of TiVo and its cohorts - they transform live television into a controlled medium by recording directly onto a hard drive, on which users can store hours of programming.

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