The term laptop computer and notebook computer are used interchangeably today. During earlier evolutionary years of the technology's development, the term 'notebook' was often applied to the lightest weight and smallest units being created, but the units and terminology are now virtually the same. However, a new category has developed of "ultra-light laptops" that pack as much performance as possible into a small package, providing users with a screen size of 12" diagonal or less.
http://www.ergoindemand.com/about-laptop-notebook-computers....
in summary: Notebooks are lighter in weight than laptops.
والله أعلم
The translation workplace 
peer agreement (net): +1
