Physics question ice and water, in physics, there is water that becomes ice, which of the following

The temperature has indeed not changed, first of all, what is the internal energy of an object? , is the sum of the total kinetic energy and total potential energy of the molecules of the object, (Note; It has nothing to do with the state of motion of the macroscopic object).

The temperature represents the intensity of the molecular motion, that is, the kinetic energy, from 0 ice to 0 water, the temperature does not change, that is, the total kinetic energy of the molecule does not change.

And what about potential energy? In fact, the potential energy becomes larger after becoming water, which is related to the molecular spacing, and will not be detailed.

1. Ice and water are the same kind of molecular composition, melting into water is just a change in the arrangement of molecules, and nothing disappears, the increased energy of internal energy is indeed endothermic in the process, 2, whether it is melting or melting, the effect is the same, learning physics is not learning language, you can't find faults.

1 Because melting requires heat absorption.

2.Well, melting is natural, and melting is heated.

Ice absorbs heat - >> water.

After ice absorbs heat, the internal energy increases and then it becomes water, while the original water temperature does not change, and the internal energy does not change. So the overall internal energy increases.

The form of the same substance is different, and the internal energy at the same temperature is also different, just like an ice-water mixture with a temperature of 0But internal energy is different.

Celsius and internal energy are two physical quantities, ice melts into water is heated, but heating does not necessarily increase the temperature, but heating internal energy must increase Thank you.

Categories: Education Academic Exams >> High School Entrance Examination.

Problem description: What is the mass of a piece of ice with a volume of 100 square meters? What is the mass of the water after it has completely melted? Does the volume of water increase or decrease? PS: Please pay for the problem-solving process.

Analysis: Density of ice:; Density of water: 1x10 3kg m3) because m=pv (p is density).

That is: M ice absolutely

Because the deformation of the object (i.e., solid to liquid) cannot change the quality and send the quantity, so m water m ice 90000kg

From p = m v, we get: v water = m p 9x10 4 10 3 = 90 (cubic meters).

Because it is 90<100, the volume of envy water is reduced

Only quality too.

Because: the water freezes, the state changes, and the mass has nothing to do with the state, so the mass remains the same and the density becomes smaller.

The specific heat capacity also becomes smaller: the specific heat capacity of water is and the specific heat capacity of ice is.

However, in the process of water freezing, heat is released, so the internal energy increases

Water turns to ice, and ice turns to water, which is a difficult question in the common test.

After deriving and summarizing, you can keep the following conclusions in mind:

No matter whether the water becomes ice or ice becomes water, the quality remains the same;

The density of ice is: the density of water is 1g cm3, so the density varies;

In the question, it is often asked how many fractions of water or ice the volume becomes larger or smaller, please remember:

Whether water becomes ice or ice becomes water, the increase (or decrease) in volume is 1 10 of ice and 1 9 of water

How to memorize: i.e. water 9, water wine. ）

Mass is a property of matter, and density is a property of matter.

The volume becomes larger, the density decreases, and the mass remains the same.

Summary. 1. When the temperature of ice and water in the ice-water mixture is the same, heat transfer can still occur between them because their internal heat energy is different. 2. In the mixture, ice and water transfer heat to lower energy ice molecules through intermolecular collisions, as well as higher energy water molecules.

This process of heat transfer is called heat conduction. So, even though ice and water are the same temperature, there is still heat transfer between them.

Ice and water in ice-water mixture are the same temperature as water, why can heat be transferred.

1. When the temperature of ice and water in the ice-water mixture is the same, heat transfer can still occur between them because their internal heat energy is different. 2. In mixed branch fibromes, ice and water transfer heat to lower energy ice molecules through intermolecular collisions and higher energy water molecules. This process of heat transfer is called heat conduction.

Therefore, even if the temperature of ice and water is the same, there is still heat transfer between them.

Are there any other forms of heat transfer besides heat conduction?

In addition to heat conduction, there is also a type of heat transfer called convection. In the ice-water mixture, when heated, the heat will cause the convection phenomenon of the water body, that is, the heat distribution in the water body is uneven, and the water molecules near the hot water will become hot, lighter, and move upward, while the water molecules near the cold water will become colder, heavier, and move downward, so as to realize the heat transfer of Chakai. Convection speeds up heat transfer, allowing the ice-water mixture to reach thermal equilibrium more quickly.

Thank you. Hello, can I ask again why polycrystals do not have a definite geometry, and what is the so-called definite geometry.

Polycrystalline is composed of many grains, and the orientation between each grain is random, so the crystal knot structure of the whole polycrystal is also irregular. This means that polycrystalline does not have a well-defined geometry because it contains grains in random directions with a large amount of lead in its crystal structure. In contrast, single crystals have a very well-defined geometry as they are made up of a continuous crystalline structure.

1.No change.

From the f-float = liquid density * discharge volume = gravity of the ice, it can be obtained: the mass of the water discharged = the mass of the ice.

Ice only changes density before and after melting and does not change mass, so the volume of ice after melting = the volume of water it expelled before. So the water surface height does not change.

2.Icebergs are connected to the land, and there is also the support force exerted by the land, so they melt and rise.

The greenhouse effect is not just melting the ice in the sea, it's just a small part, it's more about the big glaciers in Antarctica, you know Antarctica is a landmass, the ice on the ground is melting, the water is coming into the sea, the sea level is rising, and the snow is in the mountains, etc.

The water level does not change, it does not rise or fall.

Because ice is less dense than water, ice floats on the surface of the water, and a part of the volume of the ice is above the surface of the water. When the ice melts, it becomes smaller, but the part of the water that melts also enters the water, just offsetting the size of the original ice that has been reduced by melting.

The density of water is 1g cm and the density of ice is . Suppose the total volume of ice is x, the volume of water occupied by the ice floating in the water is , the volume on the surface of the water is , and the volume of the water formed by the melting of the whole block of ice is exactly , and the water level does not change.

Archimedes' law, junior high school physics knowledge.

It will go down because the density of ice is less than that of water, and when it dissolves, it becomes water, and then the volume of water is less than that of ice, and the liquid level drops.

It will go down, because it can be seen as solid water, the volume of water in 4 Yes is the smallest, and the volume will expand when the temperature is high or low, so the volume will decrease after the ice melts, and the liquid level will drop.

Constant m= water * v discharge.

The volume of water drained by the ice cube is equal to the volume after dissolving.

Descend because ice is less dense than water.

Fall, because the ice is eleven times larger than the volume of water of the same mass.

It doesn't turn into ice, it's just that the temperature reaches 0

When water freezes, it needs to be exothermic, and the condition for heat release is that the temperature of the surrounding environment is lower than 0, if the temperature of the surrounding environment is equal to 0, then the water cannot continue to release heat, so it cannot form ice.

Ideally, it is an ice-water mixture.

Because the critical temperature of ice and water is 0 degrees Celsius.

But what if it's in real life.

Or the water does not turn into ice droplets.

First of all, the buoyancy of the object in the liquid is equal to the gravity of the liquid discharged by the object, and there are wooden blocks in the ice, and the buoyancy of the whole is equal to the gravity of the ice plus the gravity of the wooden block, and the liquid level will not change after the ice is melted. If the ice contains iron, the whole will sink into the water, and after the ice melts, the iron will still be at the bottom of the water, so the liquid level will not change.

In the second case, the liquid level drops, which requires us to consider a special effect of water, heat shrinkage and cold rise, water will appear at 0 degrees Celsius, and the ice sinking at the bottom of the water will melt, and its temperature will rise, resulting in the volume of water it has turned into smaller than the volume of ice, and the liquid level will fall. This is not the case with ice lying on water. Come from.

When an ice cube with an object in its mouth floats on the water, the magnitude of the buoyancy is equal to the total weight. That is, the buoyant force of the ice is equal to the gravitational force of the ice; The buoyant force experienced by the contained object is also equal to the gravitational force of the object. When the ice melts, the gravity of the original ice is equal to the gravity of the resulting water.

That is, the gravity of the ice turning into water is equal to the gravity of the water that is discharged when the ice floats. That is, the buoyancy of the ice does not change before and after melting. However, the buoyancy of the material contained in the ice is related to the density of the object itself.

1) If like wood blocks, wax blocks. After the ice melts, the wood and wax blocks are still floating on the water. The buoyancy is still equal to its own gravity.

So the water surface height remains the same. 2) If it is a substance with a density greater than water, such as iron or stone, the buoyancy force is only equal to the gravitational force of the same volume of water as oneself. That is, at this point their buoyancy becomes less.

So the V-row is also smaller. So the water level is going to be lowered.

When remembering, it is easy to remember objects that are less dense than water as ice.

a. Under the standard atmospheric pressure, the boiling point of water is 100 The air pressure changes, and the boiling point of water also changes so a error b. Evaporation can be carried out at any temperature, and boiling is carried out at a certain temperature Therefore B error C. When the temperature reaches 0, at the same time, the water must continue to release heat in order to freeze so C error D. Water freezing is a solidification phenomenon, and solidification and exothermic are correct Therefore, D