Urgent!!! Examples of melting endothermic solidification exothermic vaporization endothermic liquefa

Melting endothermy (solid-liquid):

1.The asphalt on the road is heat-absorbed and melted by the sun;

2.The candle absorbs heat and melts after it is lit.

Solidification exotherm (liquid-solid):

1.In winter, the water freezes.

2.The candle goes out and hardens again.

Vaporization endothermy (liquid-gaseous):

1.The water sprinkled on the ground in the summer dried.

2.Water vapor is formed when water is boiled.

Liquefaction (gaseous-liquid):

1.In rain, water vapor rises along with hot air, and when it is cold at high altitude, the water vapor condenses into rain.

2.The white breath exhaled from the mouth in winter.

Sublimation (solid-gaseous):

1.The mothballs that were in the closet were gone after a while.

2.When iodine is heated, it turns directly into steam.

Ninghua (gaseous-solid):

1.The tungsten filament of the bulb is sublimated by heat to form tungsten vapor, which is then condensed on the bulb to form solid tungsten.

2.Pine flowers on windows in winter.

Melting: Put the red-hot wire on ice, the ice will melt, and the wire will no longer be red and no longer hot.

Coagulation: Use an electric soldering iron to melt the solder into a liquid state, throw it into a drop of water, the solder solidifies, and the drop absorbs heat and becomes hot.

Vaporization: By dropping a few drops of water on a red-hot piece of iron, the water turns into steam, and the place where the piece of iron drip darkens.

Liquefaction: A drink that is completely frozen, and as the water vapor in the air liquefies on the wall of the bottle, the drink is ready to drink.

Sublimation: Ninghua:

Melting and endothermic Candles are melted by the burning of fire.

Solidification and exothermic water turns into ice.

Vaporization and heat absorption, blowing a fan to remove sweat.

Liquefy ice into water.

Sublimation: Mothballs disappear after a long time.

Condensation: Water vapor turns into snowflakes.

When eating ice cream in the summer. When the ice cream hits your mouth, it feels very cool because it melts and absorbs heat.

The sassy place of the hair, the paid props card card. Got it. Play.

Haven't you ever studied junior high school physics?

Sublimation is relative to condensation, melting is relative to solidification, and vaporization is relative to liquefaction. Among them, sublimation, melting, and vaporization are endothermics, and condensation, solidification, and liquefaction are exothermics.

1. Sublimation and condensation.

Sublimation refers to the phase transformation process of a substance from a solid state to a gaseous state without going through a liquid state. For example, the sublimation of dry ice into carbon dioxide gas, and the reduction of mothballs are all caused by sublimation.

Condensation refers to the process by which a substance is converted from a gaseous state to a solid state without going through a liquid state. The conditions for the formation of condensation are relatively special, generally requiring the concentration of the gas to reach a certain requirement, and the temperature should be lower than the temperature of the condensation point, such as water vapor below 0 degrees Celsius, etc., and the cause of formation is generally caused by rapid cooling or sublimation.

2. Melting and solidification.

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 melting point. Amorphous does not have a certain melting temperature.

Solidification refers to the process of changing a substance from a liquid state to a solid state when the temperature decreases, and the temperature at which the substance solidifies is called the freezing point. For example, water freezes at 0 degrees Celsius.

3. Vaporization and liquefaction.

Vaporization refers to a phase transition from a liquid to a gas in the state of matter, and endothermic is required during the process. There are two forms of vaporization, evaporation, boiling. Evaporation occurs only on the surface of a liquid and the boiling point when the temperature of the liquid is below a certain pressure.

Whereas, boiling is a vigorous vaporization process that takes place simultaneously on the surface and inside of the liquid.

Liquefaction refers to the process by which a substance changes from a gaseous state to a liquid state. After liquefaction, the volume of the gas will become one thousandth of the original, and a large amount of heat will be released at the same time, and different gases have liquefaction critical points with different temperatures and pressures, so they must be cooled to absorb heat while pressurizing.

Melting: Solid liquid state (endothermy).

Coagulation: Liquid solid (exothermic).

Vaporization: (divided into boiling and evaporation): liquid gaseous (endothermic) liquefaction: (two methods: compressing volume and reducing temperature): gaseous liquid (exothermic) sublimation: solid gaseous (endothermic).

Condensation: gaseous solid state (exothermic).

Note: The "heat" of "endothermy" and "exothermic" here both refers to heat, not to thermodynamic concepts such as temperature, internal energy, calorific value, and specific heat capacity. It is the abbreviation of "absorbing heat" and "discharging heat".

In physics, heat cannot be said to be "how much heat it contains" or "how much heat it has", but only "how much heat is absorbed" or "how much heat is released").

1. Sublimation (endothermy) The solid state becomes gaseous; Condensation (exothermic) gaseous state becomes solid.

2. Melting (endothermy) solid state becomes liquid; Coagulation (exothermic) The liquid state becomes a solid state.

3. Vaporization (endothermy) liquid state becomes gaseous state; Liquefaction (exothermic) gaseous state becomes liquid state.

Sublimation: Ninghua:

Melt and solidify.

Vaporization Liquefaction.

The three on the left are endothermic and the three on the right are exothermic.

Sublimation: Ninghua:

Melt and solidify.

Vaporization Liquefaction.

Sublimation, melting, vaporization, endothermy.

Condensation, solidification, liquefaction, exothermy.

Melting: Ice and snow melt and ice cream drips.

Coagulation: river water freezes, refrigerators make ice cubes (anyway, the formation of various ices), vaporization: clothes are dried, boiling water is boiled, water is sprinkled to cool down, etc.

Liquefaction: Dew is formed Ice cream emitting white steam of all kinds (what you can see when you take it out of the refrigerator for stir-frying).

Sublimation: The mothballs become smaller, the filaments become thinner, and the frozen clothes are dried directly.

Bloom: rime formation, window grille formation, frost and snow formation, ice strips become larger in winter.

Vaporization: water boiling produces water steam, only selling steam;

Liquefaction: Water vapor turns into liquid water when cooled;

Melting: The iron is heated into molten iron;

Coagulation: water freezes when cold;

Sublimation: Mothballs are gone after a long time, that is sublimation;

Ninghua: The ice on the windows in winter is formed by Ninghua.

Vaporization chamber: water becomes steam, liquefaction: steam becomes water, solidification: water becomes ice melting: ice becomes water.

Sublimation: Dry ice turns into CO2

Ninghua: CO2 turns into dry ice.

Sublimation: Solid – Gas Iodine solids heat up and turn into gas.

Condensation: Gas - Solid Iodine gas cools down and becomes solid.

Melting: Solid – liquid Steel is heated to turn into molten iron.

Liquefaction: gas – liquid Methane is cooled and pressurized into a gas.

Vaporization: Liquid – Gas Water heats up into water vapor.

Coagulation: Liquid-solid water cools down and turns into ice.

Evaporation In physics, the phenomenon of vaporization that occurs only on the surface of an object is called evaporation, and evaporation can occur at any temperature, and heat is required when the liquid evaporates. Liquid molecules with greater kinetic energy can get rid of the attraction of other liquid molecules and overflow the liquid surface. Therefore, the higher the temperature, the faster the evaporation, in addition, the increase in surface area and good ventilation are also conducive to evaporation.

The heat of vaporization in the evaporation process is called the heat of evaporation and is temperature-dependent. The reverse process of evaporation is liquefaction, i.e., the transformation of the gas phase into the liquid phase. When the two processes reach dynamic equilibrium, the gas-liquid equilibrium coexists, and the vapor at this time is called saturated vapor, and its pressure is called saturated vapor pressure.

For the same substance, the saturation vapor pressure increases with the increase of temperature, and the relationship between them on the p-t diagram is called the vaporization curve. The vaporization curve is the dividing line between the gas and liquid phases, and each point on the curve represents the various states of the equilibrium coexistence of the gas and liquid phases.

This paragraph boils. Boiling is a process of intense vaporization of the surface and interior of a liquid at the same temperature, and the liquid needs to absorb heat when it boils (the temperature at which the liquid boils is called the boiling point, and at standard atmospheric pressure, the boiling point of water is 100).Each liquid boils only when the temperature rises to a certain value, when it reaches the boiling point of the foci, and when it continues to absorb heat. In general, there are always many small bubbles inside the liquid and on the walls of the vessel, in which the vapor is saturated.

As the temperature rises, the saturated vapor pressure in the small bubbles increases correspondingly, and the bubbles continue to expand. When the saturated vapor pressure increases to the same as the outside pressure, the bubbles suddenly expand, and under the action of buoyancy, they quickly rise to the liquid level and release vapor. This vigorous vaporization is boiling.

There is no fundamental difference between boiling and evaporation in terms of phase transition. When boiling, the temperature of the liquid remains constant due to the absorption of a large amount of heat of vaporization. The boiling point increases with the increase of external pressure.

When boiling, the small bubbles inside the liquid and on the wall of the vessel act as vaporized nuclei. If the liquid is too pure and lacks small bubbles, it will not boil when the temperature is above the boiling point. This liquid is called a superheated liquid.

Superheated liquids are not very stable, and the slightest vibration or impurities will immediately induce boiling, and the temperature will drop back to the boiling point. When charged particles pass through a superheated liquid, they ionize molecules near their trajectories to vaporize nuclei, forming a string of bubbles that show the trail of charged particles. The bubble chamber used for elementary particle research is designed according to this principle, and the commonly used liquids are liquid hydrogen, propane, etc.

Increasing the pressure raises the boiling point.

Tell us about examples from your life.

Melting: The solid becomes a liquid when heated, so "melting" is next to the word fire. For example, the ice cream leaves the refrigerator and melts into a sweet liquid. The lard melts after being heated in a pan.

Coagulation: The change of a substance from a liquid to a solid is called solidification, and heat is released in the process, for example, water freezes; The gravy solidifies into a jelly.

Sublimation: The phenomenon of a solid (crystalline) substance directly transforming into a gaseous state without going through the liquid stage, such as the gradual reduction of naphthalene pills (commonly known as "mothballs"), is the result of sublimation.

Condensation: The process by which a gaseous substance condenses into a solid state without going through the liquid stage. For example, the water vapor in the air condenses directly on the surface of the object to become frost. Condensation is an exothermic process.

Vaporization: The process by which a substance is converted from a liquid state to a gaseous state. There are two forms, evaporation and boiling. When the substance vaporizes, it absorbs heat.

Liquefaction: The process by which a substance changes from a gaseous state to a liquid state. When liquefied, the substance emits heat.

Liquefaction can be achieved by pressurization or cooling, or by pressurizing and cooling. The liquefied gas (gas) we use is made from gas filled under pressure. You are welcome to come and learn from each other

1. Melting: Melting is a phase change process that changes a substance from a solid state to a liquid state by heating it. Melting is an endothermic process to absorb heat. For example, ice turns into water, sea waves turn into liquid, and

2. Solidification: Solidification is the transformation of the liquid state into a solid state, and the exothermic process in the transformation process is the opposite of the process of melting

3. Vaporization: The object changes from liquid to gas, and there are two ways to absorb heat by evaporation and boiling. Evaporation is related to the surface area of the object, the velocity of the surface air, the temperature of the object, e.g., drying clothes, boiling water, etc

4. Liquefaction: The object changes from a gas to a liquid, and it is necessary to exothermic and vaporize the opposite

5. Sublimation: The object directly changes from a solid state to a gaseous state, which needs to absorb heat, for example: dry ice (solid carbon dioxide) will sublimate into carbon dioxide at room temperature, which can be used to preserve food

6. Condensation: The object directly changes from a gaseous state to a solid state, which needs to be exothermic, as opposed to sublimation, for example: the frozen clothes in the northern winter become dry, and on winter nights, the water vapor in the room often condenses into ice crystals on the window pane, and the "rime" on the branches