gas specific gravity balance

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• specific gravity — specific gravity, adj. Physics. the ratio of the density of any substance to the density of some other substance taken as standard, water being the standard for liquids and solids, and hydrogen or air being the standard for gases. Also called… …   Universalium

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• renal system — ▪ anatomy Introduction  in humans (human body), organ system that includes the kidneys, where urine is produced, and the ureters, bladder, and urethra for the passage, storage, and voiding of urine.       In many respects the human excretory, or… …   Universalium

• science, history of — Introduction       the history of science from its beginnings in prehistoric times to the 20th century.       On the simplest level, science is knowledge of the world of nature. There are many regularities in nature that mankind has had to… …   Universalium