Slide 1

The results of measurements are quantities

A quantity is expressed as ………

Let’s look at the units!

The International System of Units (SI)

The SI units

The SI base units

The unit of length (metre)

The unit of mass (kilogram)

The unit of time (second)

The unit of electric current (ampere)

The unit of thermodynamic temperature (kelvin)

The unit of amount of substance (mole)

The unit of luminous intensity (candela)

The SI derived units

Non-SI units accepted for use with SI

Multiples and sub-multiples: the SI prefixes

Does it matter if you don’t use SI units?

And now what about the numbers?

And now what about the numbers?

The correct expression of numbers

The expression of measurement uncertainty

The expression of measurement uncertainty

Reporting the measurement result and its associated uncertainty

The complete expression of the result!

Why do we need such small uncertainties?

Why do we need such small uncertainties?

Why do we need such small uncertainties?

…. and the title?

Slide 30