Brix is a scale used to measure the sugar concentration in an aqueous solution, typically expressed in degrees. It is commonly used in the food industry, particularly in the measurement of fruit juice, wine, and other liquid food products. A higher Brix value indicates a higher sugar concentration.
- Option (2) "Acidity level" is incorrect. Brix specifically measures sugar content, not acidity.
- Option (3) "Protein content" is incorrect. Brix does not measure protein content in solutions.
- Option (4) "Salt content" is incorrect. While salts can be present in solutions, Brix measures sugar, not salt content.
Thus, the correct answer is "Sugar concentration" (Option 1).