What is it that snow melts ? What is the physical phenomenon of snow melting?

If there is no salt, the ambient temperature is not easy to melt even if it is higher than 0 degrees, after the salt is sprinkled, the condensation nucleus is provided, and the temperature is slightly higher than 0 degrees to melt, and the melting point of the brine solution is generally lower than 0 degrees, and the two reasons combine to make it easier to melt snow when salt is sprinkled. (If the solution contains 20% salt, its freezing point will be reduced to -16.) Taking advantage of the low freezing point of salt, salt can be used to prevent ice formation on highway pavements and airport runways in the cold winter.

In fact, the snow is constantly melting and solidifying, but the speed is the same, so it always stays solid! We all know that the freezing point of salt water is lower than that of water, and when salt is sprinkled, the water around the snow becomes salt water, so it cannot be solidified!! In this way, the snow will continue to melt and will no longer be able to solidify, so there will be less and less!

In addition, the biggest characteristic of salt is that it absorbs water (for example, the clothes we wear with sweat are easy to get wet, which shows that salt is extremely absorbent), but another important condition for salt to melt when sprinkled on snow is that the temperature of the sprinkled salt is much higher than that of snow, because most of the salt is stored indoors. For example, the snow on the salt pile in the open air of the salt field is not easy to melt, which means that the temperature of the salt we sprinkle is already higher than the temperature of the snow, which is the condition for the snow to melt.

It melted, it was water, and the water was evaporated by the sun into the sky, and it became rain, and it rained to the river, and it went to every house.

The melting of ice and snow from solid to liquid is a melting phenomenon. The melting of snow into water is a physical change, because snow becomes water, only a change in shape, from solid to liquid, and the inner essence does not change, so the essence of snow melts and the essence of water does not change, of course, it is a physical change, and the key difference is whether the essence has changed.

Melting refers to the process of heating a substance from a solid state to a liquid state. It is one of the more common types of state of matter. Melting requires the absorption of heat and is an endothermic process.

Crystals have a certain melting temperature, called the melting point, which is equal to its freezing point at standard atmospheric pressure. The endothermic temperature of the crystal rises and begins to melt when it reaches the melting point, at which point the temperature does not change. After the crystals have completely melted into a liquid, the temperature continues to rise.

During the melting process, the crystals are in a state of coexistence of solid and liquid.

Examples of melting phenomena:(1) Ice cream becomes soft.

2) The candle ignites the wax block and turns it into wax water.

3) Solder soldering is used when repairing electrical appliances (tin blocks become tin water).

4) Use popsicles or ice cream to relieve the heat.

5) Use ice packs to cool down or cool patients with high fever.

6) Ice or snow slowly turns into water.

7) Put some ice cubes in the house in the summer to cool down.

8) When the current in the home circuit is too large, the fuse will blow due to excessive heating and the temperature reaches its melting point.

The meaning of melting snow and ice is a metaphor for the scene when everything is full of life and vitality again.

1. Basic Information

Ice and snow melting is a Chinese word that means a metaphor for the scene when everything is full of life and vitality again.

2. Status. The melting of snow does not produce new substance, but only the change of water from a solid form to a liquid state, and this change in state is a physical change.

Physical Change Concept: A change that does not generate new matter. (Physical change is simply a change in the shape and state of matter).

Snow is precipitation composed of large amounts of white, opaque ice crystals (snow crystals) and (their polymer snow masses).

Water is fundamental to the existence of all living beings on the earth, and the changes and movements of water have created our world today. On Earth, water is in a constant cycle, the water in the ocean and the ground is heated and evaporated into the sky, and this water vapor moves to other places with the wind, and when they encounter cold air, they form precipitation and return to the earth's surface. There are two types of this precipitation:

One is liquid precipitation, which is rain; The other is solid precipitation, which is snow or hail, etc.

Most of the snow falls from Nimbostratus and Altostratus, and the precipitation intensity changes slowly. The snowfall of cold weather cumulonimbus clouds has a shower characteristic, which is called a snow shower.

3. Form a sentence. In nature, there are two phenomena of ice and snow melting: one is that just after snowfall, sunlight causes the ice and snow to melt; One refers to the long period of ice and snow in winter, when spring arrives, the weather warms, and the snow melts and no longer has ice and snow. In society, the melting of ice and snow represents the arrival of hope, the arrival of warmth, wisdom and hunger!

It is a metaphor for the scene when everything is full of vitality and vitality again.

The melting of snow and ice is formed in the following sentence:

1. On this day, the ice and snow melted, and the whole world began its spring journey, ending the cold winter.

2. The ice and snow melted, and the spring breeze warmed the river.

3. In spring, the ice and snow on the river surface melted, and the river sang a song of ding ding dong.

4. Look outside, the sun is warmer than ever, she shines on the earth, the ice and snow melt, and the trees drink enough snow water and enjoy this warm sunshine.

5. Continue to walk forward, and there are still traces of melting ice and snow on the ground wet with snow and ice water.

6. Every early spring, the ice and snow melt, the earth recovers, and the apricot trees begin to burst green.

7. The ice and snow melted, the warm spring breeze blew, the green grass poked its head out of the ground, and all kinds of flowers bloomed all over the mountains, swaying with the wind.

8. In spring, the ice and snow melt and merge into a small stream that flows into the big river, and the willows on the bank of the river send out emerald green leaves, which are verdant and delicate.

9. The ice and snow melted, and the river began to flow again, and it jumped, singing happily and flowing into the distance.

10. In the spring, I will wear a green shirt and walk briskly, and wherever I have been, the ice and snow in the river have melted.

11. The Spring Girl came to my hometown with light steps, the ice and snow melted, and the spring water sang a song with tinkling dingdong.