Why do people put cabbage, radish and other vegetables in the cellar in winter to store urgent scien

Due to the tight closure of the cellar, there was a lack of oxygen inside. In addition, cabbage radish itself will produce toxic gases such as biogas during long-term storage. It is very easy to inhale carbon dioxide and biogas, and once poisoned, it is often possible to die in a very short time.

In the vast northern region of our country, especially in the northeast region, farmers generally use cellars to store vegetables in winter, so that the stored vegetables are generally relatively fresh to meet the needs of a family in winter.

So what is the principle of the cellar, in fact, the reason why the cellar can store vegetables is because the temperature in the ground is generally higher than the surface of the ground in winter. This is caused by the slow transfer of heat from the land, in the hottest time of summer, the surface temperature is very high, and about 1 meter underground is the second highest, gradually lower and lower temperature, and each height of the underground ushered in the moment of high temperature is not the same, the highest temperature on the ground should be July, 1 meter underground is August, and about 3 meters is September. When a certain depth is reached, the temperature of the ground remains the same.

The principle of winter is the same, because the land is slower to transfer cold, so when it reaches a certain depth, the temperature can be kept at a higher level. So people in the north can take the cellar to store vegetables.

And then there's less respiration, which makes vegetarian dishes fresher.

1. Because the temperature of the underground cellar in winter is generally higher than that of the ground surface, it can effectively prevent frostbite in winter. , usually in winter parts of the north prefer to use cellars to store cabbage.

2. Because the closed cellar provides a low temperature and low oxygen environment, the carbon dioxide concentration increases, which will inhibit cellular respiration, thereby prolonging the fresh time of fruits.

The cellar is warm in winter and cool in summer, and the Chinese cabbage is stored almost at a constant temperature, so it is as fresh as ever, neither frozen nor too hot to rot.

Without oxygen the temperature is also high.

Answer: A: Because the temperature in the winter in the north is low, putting a few buckets of water in the vegetable cellar is to use the heat during solidification, so that the temperature in the vegetable cellar is not too low, and the vegetables will not freeze so put a few buckets of water in the vegetable cellar

Why store bok choy in a cellar with several buckets of water?

Function: Maintain the temperature and adjust the temperature.

Reason: It is manifested in two aspects, 1. Because the specific heat capacity of water is larger, a certain quality of water rises (or decreases) a certain temperature to absorb (or release) more heat, which is conducive to using water as a coolant or keeping warm. The former is to let the water absorb and take away more heat; The latter is to let out more heat from the water.

2. Due to the large specific heat capacity of water, a certain mass of water absorbs (or releases) more heat while its own temperature does not change much, which is conducive to regulating temperature.

1) In winter, add a few buckets of water to the vegetable cellar, when the temperature drops, the water solidifies into ice, releases heat, and the air temperature is not very low, preventing freezing and damaging vegetables

2) Irrigation in the seedling field at night, because the specific heat capacity of water is larger than that of sandy soil, under the same conditions, the water will release heat when cooling at night, and the heat will be transferred to the seedlings, so that the temperature of the seedlings will not drop too low, so that the seedlings will not be frozen and damaged

So the answer is: release heat; The specific heat capacity is larger

Answer: The purpose of putting water in the vegetable cellar is to let the water release heat in the process of solidifying into ice, so that the vegetables will not freeze and spoil, so it plays a role in protecting the vegetables.

In winter, the northern climate is cold, and the water freezes and exothermy, which can prevent the vegetables from being frozen and damaged, and play a role in protecting the vegetables.

(1) When storing vegetables in winter, people often put a few buckets of water in the cellar, and the liquid water is condensed into solid ice, and the heat is released at the same time, so that the temperature of the vegetable cellar will not be too low and the vegetables will be frozen;

2) In winter, in the air-conditioned room, people often put basin water, which is the use of water vaporization phenomenon, which increases the content of water vapor in the air and increases the air humidity

3) The camphor tablets in the closet disappeared after a while, and directly changed from a solid state to a gaseous state, which is a sublimation phenomenon

So the answer is: coagulation; Vaporization; Sublimation

In winter, put a few buckets of water in the vegetable cellar, the water will solidify when it is cold, and the heat will be released from the solidification, so that the temperature of the vegetable cellar will not be too low and the vegetables will be frozen

In the supermarket**, a layer of crushed ice should be spread around the seafood, because when the ice cubes melt, they absorb heat but keep the temperature constant, so they can play a role in keeping them fresh

After rubbing the alcohol on the body, the alcohol is easy to volatilize, that is, the vaporization phenomenon will occur, and the heat will be absorbed from the body during the vaporization process, which will reduce the temperature of the body;

Therefore, the answer is: water solidification should release heat; Absorb; No change; Vaporization; Absorb;