Definition of blister. 1  1 : a fluid-filled elevation of the epidermis â compare water blister. 2  2 : an enclosed raised spot (as in paint) resembling a blister. 3  3 : an agent (such as lewisite) that causes blistering. 4  4 : a fungal disease of plants marked by raised patches on the leaves.
One acre equals 0.0015625 square miles, 4,840 square yards, 43,560 square feet or about 4,047 square metres (0.405 hectares) (see below). While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends on which yard it is based.
an American acre is 43560 square feet. an acre is 4046.72 square meters. An acre is defined as one furlong in length and one chain in width. (660 feet X 66 feet) The metric conversion is simple 1' = .3048 meters....so, the formula is: 66 ft X 660 ft = 43560 sq.ft.square meters per square foot: .3048m X .3048m = .09290304 sq. m. 43560 sq, ft, X .09290304 sq. m...so, the formula is: 66 ft X 660 ft = 43560 sq.ft. square meters per square foot: .3048m X .3048m = .09290304 sq. m. 43560 sq, ft, X .09290304 sq. m.