In English grammar, an abstract noun is a noun or noun phrase that names an idea, event, quality, or conceptâfor example, courage, freedom, progress, love, patience, excellence, and friendship. An abstract noun names something that can't be physically touched. Contrast with concrete noun.
The adult human brain weighs on average about 1.2â1.4 kg (2.6â3.1 lb), or about 2% of total body weight, with a volume of around 1260 cm3 in men and 1130 cm3 in women, although there is substantial individual variation.
As the human brain weighs roughly 1500 grams it is likely that a larger head will be no more intelligent than a smaller head but rather just belongs to a larger person. All that extra weight can come from just a plain larger skull, the muscles needed to support it, and other fluids in the head.