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Physical Magnitudes: The Science of Measurements
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In this file, you will find basic information about physical quantities and contain examples.
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Physics
Physical quantities
Physical quantities
Properties that characterize bodies or phenomena and can be measurable.
They are classified as follows:
1. Fundamental:
[L] Length
[M] Mass
[T] Time
[°T] Temperature
2. Derivatives:
[V] Volume
Fundamental quantities
We call it fundamental magnitudes because we express the others in terms of them. When we
mention the quantities, we are talking about the dimensions of each one of them. If we refer
to 7 M of fabric, the dimension of this quantity is length; if we say 3 hours, its dimension is
time. To indicate the dimensions of physical quantities we use square brackets [L].
Derived quantities
are those that are expressed in terms of fundamental quantities such as, for example, area,
density, volume, pressure, force, etcetera.
Example: The volume of a box is a derived quantity, since when calculating it it is necessary
to measure the length, height and width of the box.
Example 2: The average speed of a moving body is obtained by dividing the distance it
travels by the time it takes to travel it.
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