What measurement can indicate the sugar concentration in the wort?

The correct choice is specific gravity, as it is a key measurement used to determine the sugar concentration in wort. Specific gravity is a measure of the density of a liquid compared to the density of water. When wort is produced, the sugars extracted from the malt increase the density. Therefore, the specific gravity reading gives brewers a valuable indication of how much fermentable sugar is present.

In brewing, specific gravity is typically measured using a hydrometer or refractometer. A higher specific gravity indicates a higher concentration of sugars, which correlates with the potential alcohol content after fermentation. This measurement is crucial for planning the overall brewing process and balancing resulting flavors.

The other options do not directly measure sugar concentration. Temperature can affect fermentation and yeast activity but does not indicate sugar levels. pH level is important for understanding acidity in the wort but does not directly correspond to sugar concentration. Color intensity can offer insights into the malt profile and may suggest some characteristics of the beer, but it does not provide a quantifiable measure of sugar content.