The humidity is generally 25 to 30 degrees.

When making yogurt in a fermentation box at home, fresh yogurt is often used as the source of live bacteria, and the yogurt made will be the same as that added before fermentation. Bacteria can be seen on the lid of yogurt, so it is enough to choose the appropriate temperature according to the bacteria, generally at 42℃ ~ 45℃, because this is the most suitable growth temperature after the mixture of Lactobacillus bulgaricus and Streptococcus thermophilus.

The containers used for fermentation should be disinfected to remove miscellaneous bacteria, and sealed at the same time to avoid mixing with air, which is one of the factors for successful fermentation. Finally, the fermentation time is not as long as possible, because at the end of fermentation, the PH value of yogurt is acidic due to the products of bacteria in the fermentation process, and eventually the bacteria will die and lose their activity. Humidity should not be too high, generally at 25 degrees to 30 degrees.

Extended data:

Fermentation boxes are mostly made of stainless steel, which consists of sealed outer frame, movable door, stainless steel bracket, power control switch, water tank and temperature and humidity regulator. The working principle of the fermentation box is that the water in the evaporation tank is heated by the electric heating tube, so that the dough can be fully fermented and expanded at a certain temperature and humidity. For example, when bread dough is fermented, the fermentation box generally adjusts the set temperature before fermentation. Fermentation boxes come in many models and sizes.

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