# What are Dimensions ?

For example, consider water in the beaker shown here:

Can be calculated or derived by multiplying or dividing fundamental dimensions.

Exampls: area, velocity, density and volume

Exampls: area, velocity, density and volume

2. Derived Dimensions -

Mass, Length, Time, Temperature, Moles and sometimes Force

Fundamental dimensions can be directly measured or are independently defined.

All other dimensions can be obtained from the fundamental dimensions.

Fundamental dimensions can be directly measured or are independently defined.

All other dimensions can be obtained from the fundamental dimensions.

1. Fundamental Dimensions -

There are two types of dimensions.

In science and engineering, numbers without units are not useful
(unless they happen to be dimensionless).

Mass

Density

has derived dimensions made up of a combination of fundamental dimensions:

is a fundamental dimension.

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