air drift

air drift

[¦er ‚drift]
(mining engineering)
A roadway, generally inclined, driven in stone for ventilation purposes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
A thermal "wall" is created by placing the heaters at a close distance to each other along a perimeter boundary, usually along the uphill side, or the side facing a prevailing cold air drift. The heat from the heaters will not flow downward into the vineyard--heat only goes up, never down.
As altitude increases, air pressure drops and the gas molecules that make up air drift apart.
When the hole breaks up during October and November, pockets of ozone-depleted air drift northward and mix with air over New Zealand and other regions in the southern hemisphere.
If they dropped to sixth, they would have handed victory to the Swiss but with merely a puff behind them, Oman Air drifted over the line ahead of last placed Land Rover BAR to make certain of earning maximum points for the Hamburg Act, clinching it by a single point.
Cold air comes down the second floor stairs while hot air drifts up.