This should be analyzed from the growth conditions of yeast.

1 Nutrition: Yeast needs similar nutrients as other living organisms. Like bacteria, it has a set of intracellular and extracellular enzyme systems to break down macromolecules into small molecules that can be easily utilized in cell metabolism.

2 moisture: like bacteria, yeast must have water to survive, but yeast needs less water than bacteria.

3 acidity: Yeast can grow in the range of pH 3.-7.5, and the optimum pH is pH4.5-5..

4 temperature: at the temperature lower than the freezing point of water or higher than 47℃, yeast cells generally cannot grow, and the optimum growth temperature is generally 2℃~3℃.

5 oxygen: yeast can grow in both aerobic and anaerobic environments, that is, yeast is facultative anaerobic bacteria. In the case of hypoxia, yeast breaks down sugar into alcohol and carbon dioxide. In the presence of oxygen, it decomposes sugar into carbon dioxide and water, and in the presence of oxygen, yeast grows faster.

to sum up, through the analysis of yeast characteristics, the temperature of making rice wine is between 2 and 3 degrees Celsius, and the temperature should not be lower than degrees and higher than 47 degrees Celsius. Only by controlling the brewing temperature of rice wine can delicious rice wine be brewed.