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.
Miscellaneous Calcium Facts. 1  Calcium is the 5th most abundant element in the Earth's crust, making up 3.22% of the earth, air, and oceans. 2  Calcium is not found free in nature, but calcium compounds are common. Calcium is the main component of teeth and bones. 2  Calcium is the fifth most abundant element in the human body. 3  Approximately one third of the mass of the human body is calcium after all water is removed.