I

IMO:

International Maritime Organization

Inert gas generators:

devices containing a rapidly combustible material that yields chemically inert gases, such as nitrogen, upon combustion. Inert gas generators are widely used in automotive air bags and are used in some fire suppression systems where the inert gas displaces oxygen and thus inhibits combustion.

Inertion:

interruption or suppression of an explosion.

Infrared radiation:

electromagnetic radiation with wavelengths in the range of 0.8 to 1000 µm, which is longer than those of visible light and shorter than those of microwaves.

J

JSF:

Joint Strike Fighter.

L

Lagging:

the insulation around pipes aboard a ship.

Latent heat:

the amount of heat absorbed or evolved by a unit mass of a substance during a phase change (such as melting, sublimation, or vaporization).

LCAC:

landing craft, air cushion.

LHA:

a general-purpose amphibious assault ship.

LHD:

a multipurpose amphibious assault ship.

LOAEL:

lowest observable adverse effect level.

LPD:

an amphibious transport dock ship.

M

Mesosphere:

the region of the atmosphere extending from about 45 to 55 km to about 80 to 95 km, characterized by a general decrease in temperature with increasing altitude. The mesosphere extends from the top of the stratosphere to the temperature minimum (mesopause) at the interface between the mesosphere and the thermosphere.

MSC:

Military Sealift Command.

N

Nacelle:

a separate streamlined enclosure on an airplane for sheltering or housing something, such as the crew or an engine.

NASA:

National Aeronautics and Space Administration.

NAVAIR:

Naval Air Systems Command.

NAVSEA:

Naval Sea Systems Command.

NFPA:

National Fire Protection Association.

NIST:

National Institute of Standards and Technology.

NOAA:

National Oceanic and Atmospheric Administration.

NOAEL:

no observable adverse effect level.

O

ODP:

ozone depletion potential; an index that represents a cumulative measure of the expected effects on ozone from the emissions of a gas relative to CFC-11 (CFCl3).

OECD:

Organisation for Economic Cooperation and Development, an association of the world's wealthiest and most industrialized nations that, among other things, publishes guidelines on various technical subjects related to regulations, standards, and testing.

OSHA:

Occupational Safety and Health Administration.

Ozone:

a reactive oxygen compound (O3) found in the atmosphere; it shields Earth's surface from UV radiation.

Ozone layer:

that part of the atmosphere in which the concentration of ozone is greatest. The term is used in two ways: (1) to signify the layer from about 10 to 50 km in which the ozone concentration is appreciable, and (2) to signify the much narrower region from about 20 to 25 km in which the concentration reaches a maximum.

P

PFCs:

perfluorocarbons; hydrocarbons in which all of the hydrogen atoms have been replaced by fluorine.

Phase change:

the metamorphosis of a material from one physical phase to another, such as gas to liquid, liquid to solid, or solid to gas.

Photodissociation:

synonymous with photolysis.

Photolysis:

chemical decomposition induced by the absorption of light.

PKP:

potassium bicarbonate powder.



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