Question

what are base units?

Answer 1

base unit
noun
plural noun: base units
a fundamental unit that is defined arbitrarily and not by combinations of other units. The base units of the SI system are the metre, kilogram, second, ampere, kelvin, mole, and candela.

Answer 2

Dear student,

Base units are those units which are independent of other units and other units can be derived from them. Base units in general are fundamental.

In physics, there are 7 fundamental units and they are:

    $\boxed{\textsf{Physical Quantity\,\,\,\,\,\,\,\,\,\, Unit \,\,\,\,\,\,\,\,\,\,\,Symbol}\\\\}$

                   $\textsf{Length \,\,\,\,\,\,\,\,\,\, metre\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,m}$

                     $\textsf{mass\,\,\,\,\,\,\,\,\,\,\,\,\,kilogram\,\,\,\,\,\,\,\,\,\,\,\,\,\,kg}$

                    $\textsf{Time \,\,\,\,\,\,\,\,\,\, second \,\,\,\,\,\,\,\,\,\,\,\,\,\,\, s}$

            $\textsf{Temperature\,\,\,\,\,\,\,\,\,\,kelvin\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,k }$

       $\textsf{Electric Current\,\,\,\,\,\,\,\,\,\,ampere\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,A}$

   $\textsf{Luminous Intensity\,\,\,\,\,\,\,\,\,\,candela\,\,\,\,\,\,\,\,\,\,\,\,\,cd}$

$\textsf{Amount of Substance\,\,\,\,\,\,\,\,\,\,mole\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,mol}$