1: Measurements & Their Errors Flashcards
1
Q
Fundamental Quantities (6)
A
- Mass (kg)
- Length (m)
- Time (s)
- Amount of Substance (mol)
- Temperature (K)
- Electric Current (A)
2
Q
Prefixes (9)
A
- Femto: f (-15)
- Pico: p (-12)
- Nano: n (-9)
- Micro: μ (-6)
- Milli: m (-3)
- Kilo: k (3)
- Mega: M (6)
- Giga: G (9)
- Tera: T (12)
3
Q
Random Errors
A
Cause results to be spread about the true value due to the results varying in unpredictable ways. They affect precision
4
Q
Systematic Errors
A
Usually cause each reading to be different to the true value by the same amount due to an error in the method or equipment. They affect accuracy
5
Q
Precision
A
How close the data is clustered together
6
Q
Repeatability
A
Where an experiment, repeated with the same method, equipment and people, produces precise results
7
Q
Reproducibility
A
Where an experiment, repeated with a different method, equipment and / or people, produces precise results
8
Q
Resolution
A
The smallest interval an instrument can measure
9
Q
Accuracy
A
How close the results are to their true value
