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Quantitative Associated with numbers; many properties of matter are this Metric system Units used for scientific measurement; mili-, centi-, kilo-, etc. SI units Specific metric units used for scientific measurement Meter SI base unit of length; abbreviates to m Mass Amount of material in an object Kilogram SI base unit of mass; abbreviates to kg Temperature Measure of the hotness or coldness of an object Kelvin scale SI temperature scale; abbreviates to K Celsius scale Everyday scale of temperature in most countries; commonly used in science Liter Metric unit used to measure the volume of an object Density Property of matter widely used to characterize a substance; measured by mass/volume Exact numbers Numbers whose values are known exactly Inexact numbers Numbers whose values have some uncertainty; numbers obtained by measurement are always this Precision Measure of how closely individual measurements agree with one another Accuracy Measure of how closely individual measurements agree with the correct value Standard deviation How much the individual measurements differ from the average Significant figures All digits of a measured quantity, including the uncertain one Dimensional analysis Approach to problem-solving in which units are carried through all calculations; units are multiplied together, divided into each other, or "canceled" Conversion factor Fraction whose numerator and denominator are the same quantity expressed in different units; key to dimensional analysis Basic formula for conversion factor Given unit ⋅ (desired unit/given unit) = desired unit