Price Variance. Definition: Price variance is the actual unit cost of a purchased item, minus its standard cost, multiplied by the quantity of actual units purchased. The price variance formula is: (Actual cost incurred-standard cost) x Actual quantity of units purchased. = Price variance. If the actual cost incurred is lower than the standard cost, this is considered a favorable price variance.
Calcium carbonate is a common, naturally occurring calcium salt that is often used as a source of calcium in supplements. Its abundance in nature makes calcium carbonate the least expensive supplemental calcium salt. It is also a major component of some types of stone that are used in architecture and sculpture.
Calcium is a mineral naturally found in the blood, and as blood flows through the heart, it can leave behind tiny amounts of calcium. Typically, calcium that builds up naturally does not cause any problems, but in some people, it can cause stiffening of the aortic valve, resulting in aortic calcification.This stiffening can narrow the heart valve, impeding the flow of blood through the heart. heart murmur detected by a stethoscope is the first sign of aortic calcification. Calcium is normally found in the blood, but it can stiffen the aortic valve in some people. View slideshow of images above.