How sweet is the sweetness unit 15 degrees?

The unit of sweetness is 15 degrees, which can be compared with other references to predict the approximate sweetness. For example, the sweetness of litchi is generally around 18-20 degrees, while the sweetness of papaya is between1-13 degrees, so the sweetness of litchi is 15 degrees, which is between common litchi and papaya.

Sweetness is usually based on sucrose, and the sweetness of 10% or 15% sucrose aqueous solution is 1 at 20℃. Sweetness, also called specific sweetness, is a relative value, and other sugar amounts can be compared with this value to get sweetness.

Sweetness meter:

Sweetness meter (also called sugar meter) is an instrument to measure the sugar concentration of an aqueous solution by measuring its refractive index. All aqueous solutions can deflect light. The deflection of light can directly increase with the increase of solution concentration. Sugar refractometer is used to quickly determine the solubility of sugary solution and the density of fruit wine. Other non-sugar solubility or refractive index can also be determined by conversion.

The content of soluble solids in fruit and vegetable juice is directly proportional to the refractive index under certain conditions (the same temperature and pressure), so the concentration (sugar content) of fruit and vegetable juice can be obtained by measuring the refractive index of fruit and vegetable juice.