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chemistry chapter 2

TermDefinition
accuracy a description of how close a measurement is to the true value of the quantity measured
conversion factor a ratio that is derived from the equality of two different units and that can be used to convert from one unit to the other
density the ratio of the mass of a substance to the volume of the substance; commonly expressed as grams per cubic centimeter for solids and liquids and as grams per liter for gasses
derived unit a unit of measurement that is a combination of other measurements
dimensional analysis a mathematical technique for studying dimensions of physical quantities
direct proportion the relationship between two variables whose ratio is a constant value
hypothesis an explanation that is based on prior scientific research or observations and that can be tested
inverse proportion the relationship between two variables whose product is constant
model a pattern, plan, representation, or description designed to show the structure or workings of an object, system, or concept
percentage error a figure that is calculated by subtracting the accepted value from the experimental value, dividing the difference by the accepted value, and then multiplying by 100
precision the exactness of a measurement
quantity something that has magnitude, size, or amount
Created by: donalda1