Frozen tofu has pores because the water in tofu solidifies into ice at low temperature, and when water freezes, its volume becomes larger, and when ice melts into water, its volume decreases to form cracks. Water has the highest density and the smallest volume at 4℃. When it reaches 0℃, it becomes ice, and its volume is not shrinking but expanding, which is about 10% larger than that at room temperature.

When the temperature of tofu drops below 0℃, the water inside becomes ice, the original pores are enlarged by ice, and the whole tofu is squeezed into a net. When the ice melted into water and ran out of the tofu, it left countless holes.

Knowledge expansion:

Tofu is a kind of food processed with soybean as the main raw material. With strong China characteristics, it is known as "Oriental Cuisine". The origin of tofu can be traced back to the Han Dynasty, with a history of more than 2,000 years. Nowadays, tofu has become one of the important ingredients on the table of China people, and its preparation methods are varied.

Tofu is soft, nutritious, rich in plant protein and various minerals, and easy to digest and absorb. In China cooking, tofu is often used to make various delicious dishes, such as Mapo tofu, bean curd brain, dried bean curd, bean curd skin and so on. In addition, tofu can also be used to make drinks and foods such as soybean milk and tofu brain.

Frozen tofu is a kind of frozen tofu. Compared with ordinary tofu, frozen tofu is more compact in texture and richer in taste. Its making method is to cut tofu into small pieces, put it in the freezer of the refrigerator, take it out after being completely frozen, and then use it to make various dishes.

Frozen tofu is characterized by its pore structure. In the process of freezing, the water in tofu will form ice, and the volume of ice is larger than that of water, so it will expand the space in tofu and form many small holes. These holes still exist after the tofu is thawed, so we will feel a little sparse and porous when eating frozen tofu.

In addition, because the water in the frozen tofu is frozen, it tastes more compact and is suitable for making all kinds of stir-fried dishes and hot pot dishes.

In a word, tofu is a nutritious and delicious food. Frozen tofu is a special food processed on the basis of ordinary tofu. It is characterized in that freezing treatment is carried out in the production process to form small holes, and the taste is more compact. So while tasting delicious food, we should also pay attention to food safety and hygiene.