
A factor used to convert between two separate units; a conversion factor is constructed from any two quantities known to be equivalent. 


One part of a number expressed in scientific notation. 


A fundamental property of materials that relates mass and volume and differes from one substance to another. The units of density are those of mass divided by volume, most commonly expressed in g/cm3, g/ml or g/L. 


A unit system commonly used n the United States. 


A number represents the number of times a term is multiplied by itself. For example, 2 x 2 x 2 x 2 would be represented by 2 with an exponent of 4. 


One par of a number expressed in scientific notation; it represents the number of places the decimal point has moved. 


The standard set of units for scientific measurements, based on the metric system. 


The SI standard unit of mass 


A derived unit used to express volume. A gallon in equal to 3.785 liters. A milliliter is equivalent to 1cm cubed. 


A measure of the quantity of matter within an object. 


The SI standard unit for length. 


The unit system commonly used throughout most of the world. 


Prefixes used by the SI system with the standard units. These multipliers change the value of the unit by powers of 10. 


A system used to write very big or very small numbers, often containing many zeros, more compactly and precisely. A number written in scientific notation consists of a decimal part and an exponent part (10 raised to a particular exponent). 


The SI standard unit for time. 


The most convenient system of units for scientific measurements, based on the metric system. The set of standards agreed on by scientists throughout the world. 

Significant Figures (digits) 

The nonplace holding digits in a reported measurement; they represent the precision of a measured quantity. 


A visual outline that shows the strategic route required to solve a problem. 


Previously agreedon quantities used to report experimental measurements. Units are vital in chemistry. 


A measure of space. Any unit of length, when cubed, becomes a unit of volume. 
