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Flashcards in Key Terms Deck (10)
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1

Validity

A measurement is valid if it is measuring what it is supposed to be measuring.

2

True value

The value that would be obtained in an ideal measurement. With the exception of physical constants the true value is considered unknowable.

3

Accuracy

A measurement is considered accurate if it is close to the true value. It cannot be quantified and is influenced by random and systematic errors.

4

Precision

Denotes the closeness and agreement (consistency) between repeatedly measured values.

5

Repeatability

A measurement is repeatable when similar results are obtained by students of the same group using the same method.

6

Reproducibility

A measurement is reproducible when similar results are obtained by students of a different group using a different method.

7

Uncertainty

The interval in which the true value can be considered to lie.

8

Error

The difference between the measured value and true value.

9

Resolution

Smallest measuring interval and the source of uncertainty in a single reading.

10

Significant figures (SF)

The number of SF depends upon the resolution of the measuring instruments used and is usually the same as the instrument with the fewest SF in its reading.