The change of temperature and water, what is the law of change of water temperature

Relate. The temperature of the water is related to the depth of the water. At a certain temperature, the deeper the depth, the higher the water temperature. Of course, at the same depth, the temperature is high, the water temperature is high.

When there is little change in depth, that is, microscopically, the temperature of surface water changes with the change of insolation and air temperature.

The temperature of groundwater is closely related to ground temperature. Generally speaking, the temperature of groundwater is relatively constant, and the deeper the groundwater, the more constant the water temperature. If there is a drastic change in the temperature of the groundwater, it is a hygienic indication that there is a suspicion of contamination.

If there is a sudden increase in groundwater temperature, it may be due to the large inflow of surface water with higher temperatures. Water temperature can affect the growth and reproduction of bacteria in the water and the natural purification of the water. In addition, water temperature is also important for water purification and disinfection.

Extended information: When the depth varies greatly, i.e., macroscopically, the deeper the groundwater, the higher the water temperature. For every 100 meters down from the ground, the temperature increases by about 3 degrees Celsius.

The formation temperature of 5 10 meters below the surface does not change with the change of outdoor atmospheric temperature, and remains at 15 17 all year round. At a certain depth, the temperature increases by about 2 degrees Celsius or more for every 100 meters of depth.

In general, the temperature of groundwater is relatively constant, and the deeper the groundwater, the more stable the water temperature will be. If the temperature of the groundwater changes drastically, it is suspicious that it will be contaminated at the time of hygiene.

If there is a sudden increase in groundwater temperature, it may be due to the influx of high-temperature groundwater. The temperature of the water affects the growth and multiplication of bacteria in the water and the natural purification of the water. In addition, water temperature is closely related to water purification and disinfection.

The rate at which the water temperature decreases is proportional to the difference between the current water temperature and the ambient temperature, and the larger the difference, the faster the water temperature drops, so the water temperature begins to drop faster. As the water temperature drops closer to the ambient temperature, the difference with the ambient temperature will become smaller and smaller, so the water temperature will drop more and more slowly.

The average temperature of the 15cm soil layer is higher than the air temperature throughout the year. The heart soil is warmer in autumn and winter, and colder in spring and summer. This is due to the fact that the heart soil is masked and the hysteresis of heat conduction.

The hysteresis of the core soil temperature change is particularly noteworthy, in addition to the surface temperature may change greatly in a short period of time, the temperature change on the heart is quite gentle, and the annual variation of soil temperature is: in late autumn-winter-early spring, the temperature of the topsoil layer is lower than that of the core soil layer, so the heat flow is from the deep soil to the surface, and in late spring, summer and early autumn, the temperature of the surface soil layer is higher than that of the core soil layer, and the heat flow is moved from the topsoil layer to the center soil layer.

In general, the amplitude of seasonal variation decreases with increasing depth, disappearing at a depth of 25 m at high latitudes, 15 20 m at mid-latitudes, and 5 10 m at low latitudes.

Ways to regulate soil temperature:

Fertilizer not only fertilizes the field, but also regulates the soil temperature. All kinds of organic fertilizers, in the process of its decomposition, can release different heat, according to the size of its calorific value, there are hot fertilizer, warm fertilizer, cool fertilizer. hot fertilizers such as horse manure, sheep manure, and rapeseed cakes; Warm fertilizers such as pig manure, human manure straw fertilizer, etc.; Cool fertilizers such as cow dung, pond mud, gutter mud, etc.

Hot fertilizer on cold soil, cold fertilizer on hot soil", this reasonable fertilization method gives full play to the thermal characteristics of fertilizer and has great benefits for crop growth. In addition, the application of plant ash and organic fertilizer can darken the soil color, increase the heat absorption capacity of the soil, and also play a role in improving the soil temperature.

Fast first, then slow.

On the one hand, the temperature difference is large at the beginning, the heat transfer is fast, and the temperature rises quickly; On the other hand, when the water temperature rises, evaporation absorbs heat quickly, taking away some of the heat, so the heating is slow.

Ugly. Ugly. Ugly.

Generally speaking, knowing the temperature of the water, we also know the temperature of the water, and the two are interrelated and affect each other. As the air temperature rises, so does the water temperature; As the air temperature drops, so does the water temperature. In one day, at 6 o'clock in the morning, the temperature is 10, and the surface water temperature is about 12 15; At 12 noon, the temperature is 20, and the surface water temperature is about 15 18; At 2 p.m., the air temperature is 24, and the surface water temperature is about 18 22; At 6 p.m., the temperature is 16, and the surface water temperature is about 18 20; At midnight, the air temperature drops to 8, and the surface water temperature is about 12 18.

In short, the rise and fall of water temperature lags slightly behind the change of air temperature.

The influence of air temperature on water temperature is not so great, generally the temperature is 30, then the water temperature is about five or six degrees, but if the air temperature is below zero, the impact on water temperature will be relatively large.

1. Indoor temperature - tap water temperature range: 0 degrees.

2. Summer: General. High temperature: degrees (the sun is more affected).

3. Winter: 0 degrees.

Fourth, on average, it is a difference of 2 degrees.

Generally, the temperature of the river water is related to the temperature of the surrounding air and the density of the river water, the temperature of the river near the surface is similar to the air temperature (due to the rapid heat transfer), and the temperature of the bottom river water is about 4 degrees (if it is deep enough), because the water density at this temperature is the largest, it is at the bottom, and it is not easily affected by the temperature of the surface air.

1. The volume has changed, but the weight has not. As the temperature of the water increases, the volume of water becomes larger and larger. appliedThermal expansion and cold contractionThe hotter the surrounding environment, the larger the object will expand; Conversely, the colder the surrounding environment, the smaller the object will shrink.

2. The density of water has changed, the higher the water temperature, the lower the density of water. When the density of the water decreases, the objects in the water will sink.

Comparison before and after boiling:

Bubbles are produced when boiling. In fact, bubbles are formed in the liquid when heated to a certain temperature (non-boiling point) before boiling. The bubbles in the liquid before boiling are not the vapors after the liquid has vaporized, but the air that was originally dissolved in the liquid.

Because the higher the temperature, the weaker the dissolution ability of the gas in the liquid, so that some of the air originally dissolved in the liquid cannot be dissolved after heating, and the liquid overflows.

The bubbles before boiling, the more they reach the liquid, the smaller they become. The reason is that when the liquid is heated, the temperature of the upper layer of the liquid is lower than that of the lower layer, and the solubility of the upper layer of the liquid is stronger than that of the lower layer. In the bubble, some of the gases that cannot be dissolved in the liquid in the lower layer float to the lower temperature of the upper layer, and dissolve in the liquid again, making the bubble smaller.

Most of the bubbles produced before boiling have become smaller and disappear before reaching the surface of the liquid.

The bubble during boiling is the vapor after the liquid has vaporized, and this bubble becomes larger the higher it reaches the upper layer of the liquid. This is because the bubbles in the lower layer are mixed with other bubbles as they float up, making the bubbles bigger and bigger. The bubbles produced during boiling will burst when they reach the surface of the liquid.

After rupture, it forms water vapor with the surrounding boiling water.

After leaving, it is liquefied into small water droplets, which are the "white gas" we see.

Change in temperature and water: 1The temperature is expressed (how hot and cold the object is), and the temperature of the object can be measured with a thermometer.

3.There are three states of water – solid, liquid, and gaseous, and if the water temperature drops to 0, the water freezes. The water freezes and grows in size. When the water freezes and takes up more space, the ice will float on the surface.

The process of turning water into water vapor is bent (evaporation), and when the water evaporates, it is necessary to (absorb heat). The process of turning water vapor into water is called condensation, and when it is condensed, it is necessary to release heat from the matter.

A: A change in temperature can cause a change in the state of the water. When the temperature rises, the water absorbs the heat energy in the air temperature and the water temperature gradually increases, when the boiling point is reached, the water gradually changes from liquid to vapor to gas, the temperature of the gas source socks drops to zero degrees and below, and the water temperature gradually releases heat energy to the freezing point and changes from liquid to solid ice.

Heat can change the state of the water by changing its temperature.