Help me, science. About the tri state change of water

a. Boiling point. b. Boiling point.

c. Ingredients. d. Evaporation.

Ice absorbs heat and turns into water, and water absorbs heat into water vapor, and in the same way, water vapor becomes water when it is exothermic, and water becomes ice when it is exothermic.

The three-state change of water refers to the three states of gaseous, liquid and solid water.

Gaseous water is exothermic and condensed into a liquid state, liquid water is exothermic and condensed into a solid state, and gaseous water can also be directly exothermic and condensed into solid water.

Related information. Water (chemical formula HO) is an inorganic substance composed of hydrogen and oxygen, which is non-toxic and drinkable. It is a colorless and odorless transparent liquid at room temperature and pressure, which is known as the source of human life and is an important substance to maintain life.

Water is one of the most common substances on Earth, with 71% of the Earth's surface covered by water. It is an important resource for the survival of all life, including inorganic chemistry and human beings, and it is also the most important component of living organisms.

Pure water is a very weak electrolyte with very weak electrical conductivity. Water in daily life has more anions and cations due to the dissolution of other electrolytes, so it has more obvious conductivity.

The above content reference: Encyclopedia - Water.

Gaseous, liquid, and solid are the three states of water.

The transformation of water from liquid to gaseous state is called vaporization and is an endothermic process. To a solid state is called solidification and is an exothermic process. The transformation of water from solid to liquid state is called melting, which is an endothermic process; To the gaseous state, it is called sublimation, and it is an endothermic process. The transformation of water from gaseous to liquid state is called liquefaction, which is an exothermic process, and to the solid state is called condensation, which is an exothermic process.

Gaseous state: Water vapor, abbreviated as water vapor, is the gaseous form of water (H2O). When water reaches its boiling point, it turns into water vapor.

At one standard atmosphere, the boiling point of water is: Water can also slowly evaporate into water vapor when it is below the boiling point. In a very low pressure environment, ice will directly sublimate into water vapor.

Water vapor may contribute to the greenhouse effect and is a type of greenhouse gas.

Liquid water: Commonly used water is liquid water, water (H2O) is an inorganic substance composed of hydrogen and oxygen, which is a colorless and odorless transparent liquid at room temperature and pressure. Water is one of the most common substances, an important resource for the survival of all life, including humans, and the most important component of living organisms.

Water has played an important role in the evolution of life.

Solid water: At standard atmospheric pressure, when the temperature reaches below 0, the water forms a solid state, presenting as ice, snow, frost, hail, etc. Solid water adds color to the earth, and the splendor of "the scenery of the northern country, thousands of miles of ice, and thousands of miles of snow drifting" are all the supreme praise for the solid water to form a world of ice and snow.

Water comes in three forms: gaseous, liquid, and solid.

A temperature above 100 degrees Celsius is a gas, a temperature of 0-100 degrees Celsius is a liquid, and a temperature of 0 degrees Celsius or less is a solid.

Water exists in nature in three forms: solid, liquid, and gaseous. The specific manifestations are solid states including ice, snow, frost, and hail; Liquid states include clouds, rain, fog, and dew; The gaseous state is mainly water vapor.

The water cycle refers to the process of continuous movement of water in nature through various links in the four major spheres of hydrosphere, atmosphere, lithosphere and biosphere. There are three forms of water cycle: the cycle between the sea and the land (the sea and land cycle, or the large cycle), the cycle between the land and the land (inland cycle), and the cycle between the sea and the sea (sea cycle).

The terrestrial cycle (large circulation) is mainly evaporation (water vapor), water vapor transport (clouds, fog), precipitation (rain, dew, snow, frost, hail) and runoff (surface and underground); The inland cycle is mainly evaporation and plant transpiration and precipitation; The main marine cycles are: evaporation, precipitation.

The water cycle is of great importance to the earth, mainly including:

1. Make all kinds of water bodies in a state of continuous renewal.

2. Maintain the dynamic balance of global water.

3. Promote the movement of matter in nature.

4. It is the link between land and sea.

5. Shape the surface morphology.

: The reason for the tri-state change of water:Changes in temperatureWhen the temperature changes, water in nature can absorb or release heat, and different states of matter change.

1.The water of rivers, lakes and seas absorbs heat and constantly evaporates into water vapor;

2.Water vapor rises to the high altitude and is cooled and heated, liquefied into small water droplets or condensed into Xiaoice crystals, forming clouds.

3.Under certain conditions, the small water droplets in the cloud will gather larger and larger, turning into large water droplets, and the white clouds will become dark clouds. Water droplets fall under gravity to form rainfall; The ice crystals in the clouds also absorb heat and melt into raindrops.

Liquid water can form solid ice, and solid ice will return into liquid water; Liquid water evaporates into gaseous water vapor, which in turn condenses into liquid water.

Water has various forms in nature: clouds, fog, rain, dew, frost, snow, ice, water vapor, etc., that is, water exists in both liquid, solid and gaseous states in nature.

Water is constantly undergoing a cycle of three states in nature, and the reason for the change of the three states of water is the change of temperature. Hope.

The three states of water change are: water solidifies at 0 degrees Celsius, freezing, which is solidification, and likewise ice also melts at 0 degrees Celsius, it needs to be exothermic when it solidifies, and it needs to absorb heat when it melts.

Water boils at 100 degrees Celsius and is endothermic when boiling, whereas water vapor is also liquefied at 100 degrees Celsius and exothermic when liquefied. When water boils, water vapor escapes in large quantities from the beaker's mouth. Because water vapor is a colorless and transparent gas, like air, although the water vapor is very large in mass and size, but our naked eye or even the microscope can not see, the water vapor meets the surrounding cold air, it condenses into a lot of small water droplets, and the white gas we see is these small water droplets, not gaseous water vapor.

Water sometimes changes directly from a solid state to a gaseous state of water vapor, such as frozen clothes that gradually dry out in the sun. The water vapor sometimes condenses into a solid frost, which is then exothermic.

Mist, frost, dewdrops, water vapor, clouds, streams, rivers, lakes, seas.

The three states of water are ice, water and water vapor The process of turning a substance from solid ice to water is a melting phenomenon that requires heat absorption; The process of directly changing from solid ice to gaseous water vapor is a sublimation phenomenon that requires the transformation of three states of heat-absorbing water

1. Steam.

Water is produced through evaporation, which is one of the most important links in the water cycle. The water vapor produced by evaporation enters the atmosphere and moves with atmospheric activity. The water vapor in the atmosphere mainly comes from the oceans, and some of it also comes from evapotranspiration from the surface of the continents.

2. The water vapor near the cloud ground rises, the higher the temperature, the lower the temperature, to a certain height, if the temperature at high altitude is higher than 0 °C, the water vapor will liquefy into small water droplets, if the high temperature is lower than 0 °C, the water vapor will condense into Xiaoice crystals. These small water droplets and Xiaoice crystals gradually increase to form clouds. The changes in the state of matter involved in clouds are liquefaction or condensation.

3. Nimbus clouds are composed of many small water droplets or Xiaoice crystals. If the raindrops in the cloud increase to a certain extent, they will fall under the action of gravity to form rainfall; If the Xiaoice crystals increase and fall, they will melt and form rain when they reach a layer above 0°C. The change of state of matter involved in rain has melting.

4. Snow When the water vapor rises to the high altitude and the air temperature at high altitude drops below 0, the water vapor condenses into Xiaoice crystals, and the surrounding water vapor contacts it during the falling process and crystallizes into snow. The change in the state of matter involved in snow is condensation.

5. Hail. The cloud composed of small water droplets and Xiaoice crystals, encountering the updraft, in the process of rising, the water droplets solidify on the ice crystals and become larger, and then fall, after rising and falling several times to get larger and larger, and finally when the updraft can not support the hail, it falls from the cloud and becomes the hail we see.

As we all know, water has three state changes, which are solid, liquid, and gaseous. So, what is the relationship between them?

First of all, changing from a liquid state to a solid state is a cooling process, because the liquid state becomes a solid state must be cold enough, if it is too hot, the liquid state becomes gaseous, because there is enough energy to make the space between molecules become very large, and it becomes a gas, and if it is cold enough, the space between molecules becomes very small, and it becomes a solid. And when we turn a liquid into a solid state, we call it solidification, and when a liquid becomes a gas, we call it melting.

So, can a solid be turned into a gas directly? And can gas become solid directly?

Let's suppose that, in normal terms, solids are gases all at once, but how do we confirm this?

Let's do an experiment to prove it!

When granular iodine is heated, it does not turn into a liquid, but directly passes over the liquid and becomes a gas.

To give another example, if we put the mothballs in the cabinet for a while, we will find that it is getting smaller and smaller, but there is no liquid around, which can still prove that the solid can be turned into a liquid directly.

In this way, is it possible to confirm that solids can be turned directly into gases? If so, then what do we call it?

Sublimation. So, how do you prove that gas can be turned into a solid directly?

We heat the mothballs in a measuring cup, and then put a feather on them, and we will find that the heated mothballs become smaller and smaller, but there are very small crystals on the feathers, which are the crystals of mothballic gas, so we can confirm that the gas of mothballs can directly pass the step of turning into liquid and directly become solid.

This also confirms that the gas can directly bypass the step of turning into a liquid and thus directly into a solid. However, there is also gas in the cloud, but the strange thing is that the gas in the cloud cannot directly pass over the liquid and become solid, that is, the gas must first become liquid before it can become solid, although the process may be relatively fast, but this still exists.

This is the three-state change of water.