Question

what are the dimensions and si unit

Answer 1

dimensions =  A measure of spatial extent in a particular direction, such as height, width or breadth, or depth.

Si unit = a system of physical units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and mole, together with a set of prefixes to indicate multiplication or division by a power of ten.

Answer 2

there is difference between dimension and units . dimension is a measure of a physical variable,
where
unit is a way to assign a number of measurement to the dimension .