Are vector components scalars or vectors? Wikipedia.org says they're vectors, Nasa.gov says they're scalars, and I'm just confused. Arguments saying they're scalars: if you define unit vectors i, j and k, and say components are the numbers multiplying these vectors, then vector components are scalars. Also, the dot product of vectors a and b is defined as axbx+ayby+azbz, where ax,bx,ay... etc. are the components of the vectors, and they are scalars. Arguments saying they're vectors: often when we work with forces and fields, we decompose a vector into other vectors pointing in convenient directions (such as normal and tangential directions) and say these are their components. In that case, the components are vectors. So, are vector components scalars or vectors? Thank you for your input!