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specific gravity specific gravity
specific gravity ratio of the weight of a given volume of a substance to the weight of an equal volume of some reference substance, or, equivalently, the ratio of the masses of equal volumes of the two substances. Relationship Between Specific Gravity and Density Unlike density , which has units... Read more
amount of substance amount of substance
amount of substance Symbol n. A measure of the number of entities present in a substance. The specified entity may be an atom, molecule, ion, electron, photon, etc., or any specified group of such entities. The amount of substance of an element, for example, is proportional to the number of atoms... Read more
density density
density Ratio of mass to volume for a given substance usually expressed in SI units as (kg/m3). It is an indication of the concentration of particles within a material. The density of a solid or liquid changes little over a wide range of temperatures and pressures. Relative density (r.d.) is the... Read more
United States. Agency for Toxic Substances and Disease Registry United States. Agency for Toxic Substances and Disease Registry
AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY Hazardous waste and toxic substances in the environment are a matter of both public concern and public health. Of particular interest to many communities are waste treatment facilities and abandoned hazardous waste sites. In response to concerns... Read more
alarm substance alarm substance
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specific heat specific heat
specific heat ratio of the heat capacity of a substance to the heat capacity of a reference substance, usually water. Heat capacity is the amount of heat needed to change the temperature of a unit mass 1°. The heat capacity of water is 1 calorie per gram per degree Celsius (1 cal/g-°C)... Read more
sulfa drug sulfa drug
sulfa drug any of a class of synthetic chemical substances derived from sulfanilamide, or para-aminobenzenesulfonamide. Sulfa drugs are used to treat bacterial infections, although they have largely been replaced for this purpose by antibiotics ; some are also used in the treatment of diabetes.... Read more
Pica Pica
Pica Definition Pica is the persistent craving and compulsive eating of nonfood substances. The Diagnostic and Statistical Manual of Mental Disorders, fourth edition, classifies it as a feeding and eating disorder of childhood. Description The puzzling phenomenon of pica has been recognized... Read more
materia medica materia medica
materia medica the body of remedial substances used in the practice of medicine; the study of the origin and properties of these substances. Recorded from the late 17th century, the phrase is modern Latin, translating Greek hulē iatrikē ‘healing material’, the title of a... Read more
LD50 LD50
LD50 Lethal dose 50, or median lethal dose: the amount of a pharmacological or toxic substance (such as ionizing radiation) that causes death in 50% of a group of experimental animals. For each LD50 the species and weight of the animal and the route of administration of the substance is specified.... Read more

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