A reference to the specific gravity of a beer or wine. Gravity may at times refer to "Gravity Points", which are the units of the reading which follow the decimal point. That is, a wort with a specific gravity of 1.045 has 45 gravity points, and a wort with a gravity of 1.105 has 105 points. Since gravity points effectively remove the "water portion" of a specific gravity reading (water being 1.000 in gravity), they isolate the sugar content of the wort. This facilitates the mathematics of beer, where the amount of sugar each ingredient adds to the wort may be measured or predicted using points per pound per gallon (p/p/g). This technique is the principle behind the original gravity portion of the brewer's calculator.