Critical zone

critical zone

[′krid·ə·kəl ′zōn]
(fluid mechanics)
In fluid flow, the area on a graph of the Reynolds number versus friction factor indicating unstable flow (Reynolds number 2000 to 4000) between laminar flow and the transition to turbulent flow.
(ordnance)
Area over which a bombing plane in horizontal-flight or glide bombing must maintain straight flight so that the bombsight can be operated properly and bombs dropped accurately.

Critical zone

Any location in a building with contaminant sources sufficiently strong enough that proper control of ventilation, with no margin for error, is crucial for maintaining the immediate comfort of occupants. Critical zones may include conference rooms, smoking rooms, cafeterias, washrooms, auditoriums, or anywhere occupancy can rapidly change.
References in periodicals archive ?
How trees can survive extended periods of severe drought has been a mystery," said Richard Yuretich, director of NSF's Critical Zone Observatory (CZO) program.
Second, between the ages of 25 and 27, if you are unmarried, you are in a very critical zone and pitiable.
students who are planning careers in science, technology, engineering, and math fields are gaining valuable experiences through Research Experience for Community College Students, a summer research internship program at CU-Boulder sponsored by the National Science Foundation and the Boulder Critical Zone Observatory.
Metro Manila has been classified as beyond the critical zone due to the horrendous traffic plaguing major roads every day.
The study is part of a National Science Foundation project on the environmental effects of agriculture in the United States and an effort to determine whether the benefits of using corn as a biofuel outweigh the costs and was conducted as part of the NSF's Intensively Managed Landscapes Critical Zone.
El-Shenety believes that the rates of public debt are not worrying; yet it will reach the critical zone no matter what, because foreign debt is going to reach more than 50%.
But the critical zone will vary due to variations in internal loads, weather, sun angle, etc.
He grew stronger and it was thought he may get home - but the youngster took a sudden turn for the worse and was admitted to the critical zone once again.
In critical-zone control, the sensor can be located anywhere in the supply air duct; the duct static pressure setpoint is dynamically reset to meet the flow requirement of the most critical zone at any moment.
ARS scientists working within the LTAR network interact and collaborate with researchers from other national ecological research networks, including the National Science Foundation's Long-Term Ecological Research and Critical Zone Observatory networks; the National Ecological Observatory Network (NEON), now being developed by the National Science Foundation and NEON, Inc.
In November 2012, as part of the 50th anniversary of the Orgeval watershed (France's oldest hydrologic observatory), an LTAR network representative met with representatives of the international network of critical zone observatories to discuss potential future collaborations.

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