Withdrawal symptoms vary with the substance, but some symptoms may include increased heart rate, shaking, insomnia, fatigue, and irritability. Substance abuse is continued use of a substance in spite of school-or work-related or interpersonal problems, but the user has not gotten dependent on the substance.The individual who abuses a substance may experience legal problems and may have problems fulfilling responsibilities, such as caring for a child.ithdrawal symptoms vary with the substance, but some symptoms may include increased heart rate, shaking, insomnia, fatigue, and irritability. Substance abuse is continued use of a substance in spite of school-or work-related or interpersonal problems, but the user has not gotten dependent on the substance.
2. (Units) Also called: short ton or net ton US a unit of weight equal to 2000 pounds or 907.184 kilograms. 3. (Units) Also called: metric ton or tonne a unit of weight equal to 1000 kilograms. 4. (Units) Also called: freight ton a unit of volume or weight used for charging or measuring freight in shipping.
Also called freight ton . a unit of volume for freight that weighs one ton, varying with the type of freight measured, as 40 cubic feet of oak timber or 20 bushels of wheat. 3. metric ton. 4. displacement ton. 5. a unit of volume used in transportation by sea, commonly equal to 40 cubic feet (1.13 cu. m).