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.
1 The elephant is among the more intelligent animals. 2  The brain weight of the bull African elephant is 4.2-5.4 kg. 3  The brain weight of the cow African elephant is 3.6-4.3 kg. 4  Brain development in elephants is similar to that of humans.