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chemistry chapter 2
Term | Definition |
---|---|
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 |