# Chemistry Chapter 3 Vocab

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Measurement
A quantitative observation
Scientific Notation
Expresses a number in the form N x 10^m; a convenient method for representing a very large or very small number and for easily indicating the number of significant figures
Unit
The part of the measurement telling us to scale being used
Metric System
A decimal-based measuring system
International System (IS)
A standardized unit system based on the metric system that is used globally; the most commonly used system of scientific measurement
Meter
The basic SI unit of length
Volume
The amount of 3 dimensional space occupied by a substance
Liter
The fundamental unit of volume in the SI system, equal to 1 cubic decimeter
Mass
The quantity of matter in an object
Kilogram
The base SI unit of mass
Significant Figures
The certain digits and the first uncertain digit of measurement
Conversion Factor
A ratio used to convert from one unit to another
Equivalence Statement
The relationship between measurements in different units that measure the exact same quantity
Dimensional Analysis
the process of using conversion factors to change from one unit to another
Fahrenheit Scale
A temperature scale on which water freezes at 32 degrees and boils at 212 degrees
Celsius Scale
A temperature scale based on powers of 10 on which water freezes at 0 degrees and boils at 100 degrees, most commonly used for scientific measurement
Kelvin (absolute) scale
A temperature scale on which 0K is abolute zero, water freezes at 273K, and water boils at 373K; the Kelvin is the SI unit of temperature
Density
The mass of a substance per a given volume of that substance
Specific Gravity
the ratio of density of a given liquid to the density of water at 4 degrees celsius