##### KTQ 3

Unit of Measurement

Is one increment of the system being used

Significant figure (digits)

The certain digits and the uncertain digit together

The digits in the numerical value of a measurement that indicate its precision.

pure number

the number of units determined by the act of measuring

counted number

significant digits don't apply to these (Ex. half, twice,dozen, 30 students, 10 books, etc)(non-measurements)

measurement

A number that indicates quantity and is followed by a unit.

The product of the pure number and the unit of measurement

accuracy

refers to how close a measurement is to the accepted reference or theoretical value

scientific notification

a number expressed bewteen 1 and 10 multiplied by an exponential factor (10 raised to some power)

exponential factor

10 raised to some power

precision

the agreement between two or more measurements (reproducibility of data)

exponent

the power 10 is raised to in scientific notation

derivative unit

Units of measurement that are derived from the basic SI units

unit analysis

AKA dimensional analysis; tool for converting a measured value from one unit to another

a problem-solving tool in which the units of numbers are changedc by being multiplied by a conversion factor equal to 1.

mass

the measure of the amount of matter in a given substance (always constant)

conversion factor

the ratio of two measurements and their units that represent the same quantity (1)

weight

the gravitaional pull exerted on an object (will change based on location)