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### 13 Cards in this Set

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 accuracy a relative measure of the ability of an instrument to correctly measure the mass, or other characteristic, of an object; it is also the correctness of the measurement. balance A device used to measure the gravitational mass of a body. The device consists of a lever arm that is balanced on a fulcrum, pivot. This lever arm usually has a material pan on one end and some standard counterweights on the other. buoyancy The force that pushes an object up and makes it seem to lose weight while in a fluid. density The amount of mass contained in a given volume of materials. gravitational force The attractive force that exists between two objects that have mass. hydrometer A floating instrument that is used to determine the density of a liquid. kilogram The basic unit of mass in the metric sys. (1 L of water is equal to one kg). mass the amount of material that is in an object that is expressed in g's and kg's. matter The material a thing is made up, having mass and occupying space. precision A measure of an instrument's ability to repeat a measurement and get the same result. range A measurement of the spread of a set of measurements. Range is found by taking the difference of the smallest measurement from th largest measurement. ratio A fractional comparison of two numbers. The ratio of A to B can be expressed as A/B. Specific Gravity The ratio of the density of a material to the density of a standard.