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 ?
The critical zone is at minimum flow with its FPB fan running.
The height limitations also help cGMP's because at heights lower than the 32 inches an operator can extend into the critical zone above the trays while stooping to load the tray into the rack.
The model reveals that "a critical zone exists in which a small, incremental increase in poaching greatly increases the probability of extinction," assert John S.
Conceptual approaches based on Essential Variables, Macrosystem Ecology and cross-scale interactions allow for a deeper understanding of the Earth~s Critical Zone.
This data includes the type of air handling system (constant volume or VAV); the area served by the system, including by zone occupancy type, and whether the space is currently occupied or unoccupied; the population of occupants by zone, with occupants in any vacant space calculated based on ASHRAE default values for occupant density; total system air flow; system air flow diversity; which zone or zones are determined to be critical zones in terms of outside air requirements; and the minimum air flow to each zone, particularly the critical zone(s).
Her ward has three key areas; the critical zone, a central area of unimpeded order where the medical action occurs; the healing zone, where the focus is on single patient rooms where recovery takes place; and the wellness zone, where the psychological needs of patients and staff are met.
Oceanographers have long realized that nutrients and pollutants from land sources travel downriver and collect in the waters of estuaries -- the ecologically critical zone where river meets ocean.
The LTER-Europe network and the European Critical Zone community will collaborate to achieve these goals.
2] sensor is an inadequate indicator of critical zone occupancy.
This program speeds a highly skilled team to a patient's bedside at the first sign of a downturn - a move that often prevents patients from entering the critical zone leading to cardiac arrest.
This critical zone has to be evaluated initially depending on occupancy density and load variation.
Guitar strings go "dead" when dirt and oils become trapped between the windings -- a space called the 'The Critical Zone of Tone.

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