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.
How many square feet there are in a acre. 1 ftÂ² is 0.000247105 acres. To calculate how to convert square feet to acres you can multiply the number 0.000247105 times. For example, 25 square feet would be 25 x 0.000247105 = 0.006177625 acres. Or you can use our free square feet to acres converter :) 3943 square feet to acres.