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.
Largest brain by mass. The animal with the largest brain by weight is the sperm whale. The average full size sperm whale has a brain that is 9kg (about 20lbs). Although this is very big, it is only 0.02% of the total body mass of a sperm whale (the human brain is about 2% of our total body mass).