What happens when you slowly pour water and cooking oil into a deep glass along the glass wall and add a grape or a short candle?

Cooking oil is above the water surface, and grapes or candles move back and forth between the water layer and the oil layer.

Edible oil is insoluble in water, and the density of edible oil is less than that of water, so as to judge what will happen; When a candle is put into a cup of cooking oil and water, it will sink at first. After the candle is partially immersed in water, because the buoyancy of water and edible oil is equal to the gravity of the candle, the candle will be suspended between the edible oil and water.

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We know that edible oil is insoluble in water, and because the density of edible oil is less than that of water, when the edible oil is slowly poured into a glass filled with water along the glass wall, the edible oil is on the top and the water is on the bottom, and they are not mixed.

When a candle is put into a cup of cooking oil and water, it will sink at first. After the candle is partially immersed in water, because the buoyancy of water and edible oil is equal to the gravity of the candle, the candle will be suspended between the edible oil and water.

Extended data:

Archimedes principle scope of application:

Archimedes' principle is applicable to objects completely or partially immersed in static fluid, and requires that the lower surface of the object must be in contact with the fluid (Figure 1).

If the lower surface of an object is not completely in contact with the fluid, such as a submerged pier, a sunken ship inserted into the seabed, a pile driven into the bottom of a lake, etc. In this case, the force of water at this time is not equal to the force specified in the principle.