Usually we see that the oil is always floating on the water, if not with the help of external forces

Use your brain, be good at thinking, and deserve praise! This problem, the concept of diffusion is the phenomenon of different substances entering each other when they are in contact with each other, diffusion can occur between two objects in any state, then, oil and water can also diffuse each other, that is to say, the oil molecule may be under the water molecule, this sentence is true! Molecules are moving irregularly and endlessly!

Oil and water are both liquid, diffusion exists, but the diffusion is very slow, there is a force on the surface of the molecule, which will prevent this diffusion, oil and water are two different substances, one is organic matter, the other is inorganic, according to the principle of similar compatibility, mutual miscibility will not occur!

Diffusion is the thermal movement between molecules, but oil and water are insoluble (oil contains hydrophobic base), and the density of oil and water is different, so it will naturally stratify, so at most it will form an emulsion, which is still stratified after precipitation, and it will not be below, (whether it can be diffusion is affected by other external forces, after all, the thermal movement is very weak.)

The oil molecules will not go under the water molecules, just like if you put a lot of plastic foam debris on the water, the debris will spread on the surface of the water and will not enter the water, the premise of diffusion is that there is no external force or the external force is weak, because there is buoyancy, so the oil molecules will not be under the water molecules.

It can be said that there are oil molecules diffused in the water, but because the force (repulsion) between the two molecules is relatively strong, they have to stay away from each other, and the density of water and oil is different, causing most of the oil molecules to float on the surface of the water.

Oil is insoluble in water, so oil cannot diffuse freely in water, and its density is smaller than that of water, so it floats on the surface of the water.

Because oil is less dense than water, oil can float on the surface of the water.

First of all, oil and water are immiscible with each other and are mutually exclusive two phases. This constitutes two layers.

Secondly, the specific gravity of oil is smaller than that of water, and the oil layer floats on the water.

1. Because oil is insoluble in water.

2. The density of oil is smaller than that of water.

1. Because oil is insoluble in water.

2. The density of oil is smaller than that of water.

I agree with the first floor.

1. The density is less than water.

2. Insoluble in water.

The density of oil is lighter than that of water.

First of all, oil and water are immiscible with each other and are mutually exclusive two phases. This constitutes two layers.

Secondly, the specific gravity of oil is smaller than that of water, and the oil layer floats on the water.

1. The density is less than water.

2. Insoluble in water.

Agree with the upstairs, of course, the less dense oil will float on top of the dense water.

Because the oil floats on the surface of the water and is supported by the upward force of the water, while the force of the square or polygon is not equal, the force of each point of the circle is equal. So, when the oil first appears on the surface of the water, it may have different shapes, but after a while it will form a circle!!

Surface tension.

A round shape is the most material-efficient shape, and it is similar to blowing bubbles that are spherical.

Surface tension.

Because the force at each point of the circle is equal.

1. Liquids have the property of automatically reducing the surface area, and the outer surface area of the sphere is the smallest under the same volume.

2. There is surface tension at the interface between oil and water, between oil and air, and at the interface between water and air, the tension of the oil-water interface and the tension of the oil-air interface are to maintain the spherical shape of the droplet, and the tension of the water-air interface is trying to spread the oil film, and the result of the interaction between them causes the oil droplets to be round. The surface tension between substances with different densities is different, so the thickness of the spread is also different.

3. The process also involves formula calculus. For details, see my undergraduate textbook Physical Chemistry.

First of all, oil and water are immiscible with each other and are mutually exclusive two phases. This constitutes two layers.

Secondly, the specific gravity of oil is smaller than that of water, and the oil layer floats on the water.

Under the action of surface tension, the liquid has a tendency to minimize its own surface area, and in the case of the same volume, the surface area of the sphere is the smallest, and the circumference of the circle of the same area is the smallest, so the liquid is generally close to the sphere.

The oil on the surface of the water, because of gravity, could not maintain a spherical shape, so it spread into a circle.

There is surface tension on the surface of the oil, which controls the volume of the oil.

I guess it's because the oil doesn't dissolve in water.

Go see "100,000 Whys".

It's impossible not to borrow external force, even if it's hollowed out, if there is an external force, it's okay, what you want is speed, and it's the speed of the water. I don't think it's possible to have an external force, because the density of stone is much greater than the density of water, and it should be impossible without external force.

Hollow out the stone and seal the opening. (If this is not possible, you can sprinkle salt into the water to increase the density of the water).

How deep is the water? Is there a salvage ship nearby, if the strength of the hull is enough, then use a wire rope to find a trailer or use a winch to get to the water's edge and then deal with it, more than 1000 pounds is not too heavy, I wish you all the best!

Look what kind of oil it is.

Gasoline, diesel, peanut oil, etc. are fine.

Some of them are miscible with water.

There is also a part of the specific gravity that is greater than the water, at the bottom of the water.

Yes, so fire safety knowledge has always said not to use water to extinguish the oil pot.

There are two reasons why oil can float on the water:

a) The density of oil is smaller than that of water;

2) Oil and water are not miscible in two liquids.

So, the oil will float on the water.