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.
Larger brains are needed partly to control larger muscles. A sperm whale's brain weighs about 17 pounds and an elephant's weighs a little more than 10 pounds. An owl's brain weighs 0.005 pounds and a bullfrog's about one-tenth of that.