What does the term "SRM" measure in beer?

The term "SRM" stands for Standard Reference Method, which is a measurement system specifically used in the brewing industry to quantify the color of beer. This measurement is essential because the color can influence a consumer's perception and experience of the beer. The SRM uses a light beam directed through a beer sample, and the intensity of light transmission is evaluated to determine the color in terms of a numerical value.

This standardized method allows brewers and consumers alike to communicate more effectively about beer color, ensuring consistency and clarity in style descriptions. By providing a clear way to identify and compare beer colors, SRM helps both brewers and drinkers appreciate the visual aspects of beer, which can be an integral part of the overall drinking experience.

The other options do not pertain to what SRM measures; SRM is not associated with bitterness, alcohol content, or carbonation level. Each of these aspects has its own specific measurement standards and methods within the brewing field.