Are liquids and fluids completely different substances

Liquids are shapeless, fluid, and often affected by containers. Whatever shape the container is, inject the liquid, and the liquid will take on whatever shape it is.

With a certain volume, the volume of the liquid is fixed under constant pressure and temperature.

It is difficult to be compressed into a smaller volume of substance.

A fluid is a fluid substance, and it is an object that is continuously deformed by any tiny shear force. Fluid is an umbrella term for liquids and gases. It has easy flowability, compressibility, and viscosity.

Fluids composed of a large number of molecules that are constantly thermally moving and have no fixed equilibrium position have a certain degree of compressibility, the compressibility of liquids is very small, and the compressibility of gases is large, and when the shape of the fluid changes, there is also a certain movement resistance (i.e., viscosity) between the layers of the fluid.

To sum up, liquids and fluids are two completely different and very close substances.

A solid is a state in which matter exists. Compared with liquids and gases, solids have a relatively fixed volume and shape, and the texture is relatively hard. Solid is a macroscopic system composed of particles of the order of magnitude 10**23, and is a complex many-body system.

The ground state of a solid (i.e., the state at t=0k) is not only the state with the lowest energy, but also some sort of ordered state. Liquids are one of the three major forms of matter. It is not a definite shape and is often affected by the container.

However, its volume is fixed under constant pressure and temperature. Heating or decompression generally vaporizes a liquid into a gas, such as heating water into water vapor. Pressurization or cooling generally causes a liquid to solidify and become a solid, such as cooling water into ice.

However, pressurization alone does not liquefy all gases such as oxygen, hydrogen, helium, etc. Gas refers to a deformable and flowing fluid that has no shape or volume. A gas is a state of matter.

A gas is a fluid like a liquid: it can flow, it can be deformed. Unlike liquids, gases can be compressed.

If there is no restriction (container or force field), the gas can diffuse without limiting its volume. The atoms or molecules of gaseous matter can move freely with each other. The kinetic energy of atoms or molecules of gaseous substances is comparatively high.

1. Differences: The liquid has no fixed shape and will change with the change of the container; Liquids can also flow, solids have a fixed shape and do not change with the change of the container; Solids also don't flow.

2. Similarities: Each liquid or solid has its own composition, as long as the substance is determined, the composition is determined; And they're hard to compress.

The molecules of the solid are arranged in a tight order one by one, the gaps between the molecules are relatively small, and the molecules vibrate in a fixed position. Solids can be divided into two categories: crystalline and amorphous. Crystals have regular geometric shapes, whereas non-crystals are irregular in shape.

Crystals melt at a definite temperature called the melting point, while non-crystals have no melting point.

I hope I can help you with your doubts.

Not all solids are not fluid, some objects are fluid, and this is what kind of solid it is.

Liquids can flow, solids cannot.

Liquids can flow, such as: water, oil, wine, blood, etc.;

Solids cannot be moved by themselves, such as tables, chairs, stools, etc.

Solid: the molecules are tightly arranged, the intermolecular force is large, there is a certain volume, it can maintain a certain shape, resist the action of a certain external force (tension, shear, compression), and the deformation is small.

Fluid: The molecular arrangement is loose, the cohesion between the molecules is small, it cannot maintain a certain shape, it cannot resist the action of tensile force and shear force, it is easy to flow, and the deformation is large.

The common problem between gas and liquid: both have the characteristics of "amorphous and easy flow" of fluids.

Differences: (1) The distance between the molecules of the liquid is smaller than that of the gas, and its compressibility is small;

2) Liquids occupy a definite volume and have a free surface, while gases do not.

3) Liquid is viscous and decreases with the increase of manuscript temperature, while gas is the opposite.

Be. Definition of object: All tangible orange substances that objectively exist in nature are called chaotic objects.

Forms of existence: gaseous, liquid, solid.

Because the shape of liquids and gases is not fixed, the objects we study are solids. This leads to confusion about whether a liquid is an object or not.

All have a certain volume that is not easy to compress Solid has a certain shape but no fluidity, whereas liquid does not have a certain shape but has fluidity Both have fluidity Liquid is not easy to compress, gas is easy to compress.

Analysis: Mainly from the molecular arrangement, spacing and force of the three states of matter

Solid molecules only vibrate in the equilibrium position, the molecular spacing is very small, the intermolecular force is very large, the solid maintains a certain shape and a certain volume, and is not easy to be compressed

The liquid molecules vibrate in the equilibrium position for a period of time, and then move to other positions to vibrate, the molecular spacing is larger than that of the solid, the intermolecular force is smaller than that of the solid, the liquid maintains a certain volume, but does not have a certain shape, and is not easy to be compressed

Except for collision, gas molecules do uniform linear motion, the molecular spacing is large, the intermolecular force is very small, there is almost no certain volume and shape, and it is easy to be compressed

Answer: Solid molecules only vibrate in the equilibrium position, the molecular spacing is very small, the intermolecular force is very large, the solid maintains a certain shape and a certain volume, and is not easy to be compressed

The liquid molecules vibrate in the equilibrium position for a period of time, and then move to other positions to vibrate, the molecular spacing is larger than that of the solid, the intermolecular force is smaller than that of the solid, the liquid maintains a certain volume, but does not have a certain shape, and is not easy to be compressed

Except for collision, gas molecules do uniform linear motion, the molecular spacing is large, the intermolecular force is very small, there is almost no certain volume and shape, and it is easy to be compressed

Therefore, the similarity between solids and liquids is that they both have a certain volume and are not easy to compress; The difference is that solids have a certain shape but no fluidity, while liquids do not have a certain shape but have fluidity Compared with gases and liquids, the similarity is that both have fluidity, and the difference is that liquids are not easily compressed, and gases are easily compressed

The composition of the solid and liquid of the same object is the same, but the form is different. The density of solids is different from the density of liquids, so their forms are different, this is why there are so many forms in nature, gaseous solid liquid state, of course, nature in addition to these three forms there are other forms, such as free state, etc., I don't know much about the rest, I am a sophomore high school student, I can only answer for you according to what I have learned, I hope it will help you, as for why the density is different, there are many factors, such as air pressure and temperature, the distance between molecules, etc., If you are interested in these, I suggest you ask your teacher, or check the books, thank you, it is my pleasure to answer for you.