other possible situations where using the incorrect set of units can be to your disadvantage or even dangerous.
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A physical quantity is anything that you can measure. For example, length, temperature, distance and time are physical quantities.
There are many different systems of units. The main systems of units are:
SI units
c.g.s units
Imperial units
Natural units
SI units (ESAF)
We will be using the SI units in this course. SI units are the internationally agreed upon units.
SI Units
The name SI units comes from the French Système International d'Unités, which means international system of units.
There are seven base SI units. These are listed in Table 1.1. All physical quantities have units which can be built from these seven base units. So, it is possible to create a different set of units by defining a different set of base units.
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