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Dangerous goods. Those substances and articles the carriage of which is prohibited by ADR, or authorized only under the conditions prescribed therein;

Dangerous reaction means:
(a) Combustion or evolution of considerable heat;
(b) Evolution of flammable, asphyxiant, oxidizing or toxic gases;
(c) The formation of corrosive substances;
(d) The formation of unstable substances; or
(e) Dangerous rise in pressure (for tanks only).

Defined deck area. Defined deck area means the area, or the weather deck of a ship, or of a vehicle deck of a roll-on/roll-off ship, which is allocated for the stowage of dangerous goods.

Degrees Celsius (Centigrade). The temperature on a scale in which the freezing point of water is 0oC and the boiling point is 100oC. To convert to Degrees Fahrenheit, use the following formula: oF = (oC x 1.8) + 32.

Degrees Fahrenheit. The temperature on a scale in which the boiling point of water is 212oF and the freezing point is 32oF.

Density. The mass per unit volume of a substance. For example, lead is much more dense than aluminum.

Dermatitis. Inflammation of the skin from any cause.

Dermatosis. A broader term than dermatitis; it includes any cutaneous abnormality, thus encompassing folliculitis, acne, pigmentary changes, and nodules and tumors.

Dose-response relationship. Correlation between the amount of exposure to an agent or toxic chemical and the resulting effect on the body.

DOL. US Department of Labor. OSHA and MSHA are part of the DOL.

DOT. US Department of Transportation.

Drum. A flat-ended or convex-ended cylindrical packaging made out of metal, fibreboard, plastics, plywood or other suitable materials. This definition also includes packagings of other shapes, e.g. round, taper-necked packagings or pail-shaped packagings. Wooden barrels and jerricans are not covered by this definition.

Dusts. Solid particles generated by handling, crushing, grinding, rapid impact, detonation, and decrepitation of organic or inorganic materials, such as rock, ore, metal, coal, wood and grain. Dusts do not tend to flocculate, except under electrostatic forces; they do not diffuse in air but settle under the influence of gravity.

Dyspnea. Shortness of breath, difficult or labored breathing.