Cement, or Portland cement, is a dry powder made. from limestone and other materials. It is burned in a. kiln and then finely ground. Cement reacts chemically. with water to cause concrete to harden.
There are 43,560 square feet in a acre; this is 4,840 square yards. You can find a conversion calculator at http://www.unitconversion.org/area/acres-to-square-foots-conversion.html Originally, the size of an acre was approximately the amount of land an ox could plow in a day.here are 43,560 square feet in a acre; this is 4,840 square yards. You can find a conversion calculator at http://www.unitconversion.org/area/acres-to-square-foots-conversion.html Originally, the size of an acre was approximately the amount of land an ox could plow in a day.
How Many Square Feet in an Acre. Aug 31, 2011 It is easy to imagine an area of one square foot1. In fact, it is a square which has sides of one foot. But many people have problems with visualizing an acre2, to say nothing of converting square feet to acres. There is a good analogy that helps to envision an acre. It is known that a football field is a bit bigger than one acre.