The beer refractometer measures the alcohol content of beer by using the principle of refractometry. When light passes through a liquid, it bends or refracts due to the varying density of the liquid. The degree of refraction is determined by the refractive index of the liquid, which is a measure of its optical density. Beer contains various substances that impact its refractive index, including water, alcohol, malt sugars, and other compounds. By shining a beam of light through a small droplet of beer, the refractometer can measure the degree of refraction and calculate the beer's refractive index. From this measurement, the alcohol content of the beer can be estimated using a conversion formula that takes into account the specific gravity of the beer before and after fermentation. As beer fermentation increases the alcohol content while decreasing the specific gravity, the refractometer provides a convenient and accurate way to measure the alcohol content of beer in real time, helping brewers to ensure consistency and quality in their products.
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