Chapter 1
Introduction Part 2:
Matter and
Measurements
Ms Veronique Joubert
,Learning Outcomes...
The difference between exact numbers and inexact numbers.
The difference between accuracy and precision.
Uncertainties in measured and reported values – significant figures.
Expressing values in scientific and non-scientific notation.
Interpretation of measurement units.
How to do unit conversions.
Dimensional measurements for area and volume.
Determination of density for matter.
Measuring temperature of substances.
Department of Chemistry
, What are
measurements?
, Exact numbers and inexact numbers
Exact numbers
~ values that are known exactly, there is no uncertainty (doubt)
its measurement.
Eg. 12 eggs in a dozen, 10 mm in 1 cm, 34 students in the clas
Inexact numbers
Measured values with some degree of uncertainty in them. All
measurements made using measuring apparatus have a degree of erro
them.
Limitations in measuring equipment, human error, random errors.
Department of Chemistry
Introduction Part 2:
Matter and
Measurements
Ms Veronique Joubert
,Learning Outcomes...
The difference between exact numbers and inexact numbers.
The difference between accuracy and precision.
Uncertainties in measured and reported values – significant figures.
Expressing values in scientific and non-scientific notation.
Interpretation of measurement units.
How to do unit conversions.
Dimensional measurements for area and volume.
Determination of density for matter.
Measuring temperature of substances.
Department of Chemistry
, What are
measurements?
, Exact numbers and inexact numbers
Exact numbers
~ values that are known exactly, there is no uncertainty (doubt)
its measurement.
Eg. 12 eggs in a dozen, 10 mm in 1 cm, 34 students in the clas
Inexact numbers
Measured values with some degree of uncertainty in them. All
measurements made using measuring apparatus have a degree of erro
them.
Limitations in measuring equipment, human error, random errors.
Department of Chemistry
