Module 2 - Measurements Flashcards
Refers to the capability to measure a value that is as close as possible to the actual or true value.
Accuracy
Accuracy is the degree of ______ of a measurement.
Exactness
Refers to the consistency or repeatability of measurements, that is, how close two or more measurements are to each other.
Precision
Can be caused by faulty instrumentation or faulty technique. Usually when a series of measurements is precise but not accurate.
Systematic errors
Measurement is defined by both a
_____ and a ____.
quantity, unit
A system of measurement that is based on various units that are not related to one another by a consistent factor.
The English System
A system of measurement that uses units that are always related by a factor of ten or by a power of ten.
The Metric System
In 1960, an organization of scientists met in France to determine standards for scientific measurements. This group established what system of measurement?
SI units
Another type of unit based on multiplication or division and then applying the appropriate prefix or combination of units.
Derived units
A conversion technique approach that uses a known relationship to compare unknown relationships.
Ratio approach
A conversion technique approach that can form manipulated ratio more quickly. The known quantity is multiplied by the ratio, so that units cancel, and results unknown quantity with the desired units:
Dimensional analysis approach
Is a zero alone in front of a decimal point significant or not significant?
Not significant
Is a zero to the right of the decimal point
but before the first nonzero digit significant or not significant?
Not significant
Is a zero between nonzero numbers significant or not significant?
Significant
Is a zero at the end of a number and to the
right of the decimal point significant or not significant?
Significant
