1. A periodical publication of astronomical data designed primarily for air navigation, but often used in marine navigation. 2. A joint publication of the U.S. Naval Observatory and H. M. Nautical Almanac Office, Royal Greenwich Observatory, designed primarily for air navigation. In general the information is similar to that of the Nautical Almanac, but is given to a precision of 1' of arc and 1s of time, at intervals of 10m (values for the sun and Aries are given to a precision of 0.1').

Related Terms

AIR COOLER

A factory-encased assembly of elements whereby the temperature of air passing through the device is reduced.

AIR INFILTRATION

The leakage of air into a room through cracks in doors, windows, and other openings.

CLEAN ROOM

A facility or enclosure in which air content and other conditions (such as temperature, humidity, and pressure) are controlled and maintained at a specific level by special facilities and operating processes and by trained personnel.

OUTDOOR AIR

Air taken from outdoors and, therefore, not previously circulated through the system.

SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.

AIR

A substance containing by volume approximately 78 - 79% nitrogen; 20.95% oxygen, 0.94% argon, traces of carbon dioxide, helium, etc.

ACTIVATED CARBON

Is a specially processed carbon, used as a filter drier. Commonly used to clean air.

AIR REHEATING

In an air conditioning system, the final step in treatment, in the event the temperature is too low.

ABSOLUTE HUMIDITY

Amount of moisture in the air, indicated in kg/kg of dry air.

AERATION

The state of air being suspended in a liquid such as a lubricant or hydraulic fluid.

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