Abstract
The float-sink is an instrument used to demonstrate the pressure transmission of liquids, and it is a vivid proof of Archimedes's principle and Pascal's principle. When pressure is applied to the container in which the sinker is located, the sinker sinks; when the pressure is released, the sinker floats up. This phenomenon qualitatively proves Archimedes's law. But when the sinker sinks to a certain critical depth, even if the pressure is released, the sinker will no longer float up. This phenomenon is the so-called "irreversible sinker". This article mainly analyzes the irreversible principle and influencing factors when the float-sink reaches the critical depth and explores the influence of different influencing factors on the critical depth through mathematical analysis and experimental methods. Finally, it is concluded that the critical depth when the float is irreversible is related to factors such as the mass of the float, the volume of gas in the float and the height of the water in the container, and the critical depth has a linear relationship with the mass of the float.
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