In fact, there is a lack of necessary comparison. The correct way to ask this question is that if you gently put a dry coin into plain water, it will float on the water; but in soapy water, no matter how careful you are, the part will sink immediately and never float. soapy water.
This is because ordinary water has significant surface tension, which is a surface clamping force. It is the existence of this force that can make a coin that is not too heavy float on water. When soap is added to water, due to the surface activity of soap, the surface tension of the water surface is reduced and the water surface cannot withstand the gravity of the workpiece, rendering it unable to float.
A yuan coincan hold 45 to 49 drops of water. If you drop water on the part, you will find that it is bulging and nNumerous droplets of water are bulging inside. Water is made up of water molecules. Water molecules are not independent but attract each other. The water molecule in the middle is surrounded by other water molecules coming from all directions.
The force is uniform. When the volume is the same, the surface area of the ball is the smallest, so the water droplets flowing on the workpiece melt into a spherical shape, so it can hold more than 40 water drops above.
Operational scenario
The first time you use a straw, the piece can literally hold about 5 drops of water. The second time I use the small syringe, the piece literally holds about 30 drops of water. The experimenter must be careful. The distance between the straw and the workpiece should neither be too high nor too low, water droplets on the workpiece will not be able to resistto the acceleration of free fall and will collapse quickly. and flow. If it's too low, it won't work. Being close to the water droplets will destroy the surface layer of the water droplets.
The accumulation of water droplets on parts is an interesting phenomenon. At first, the water droplets are small and occupy the edge of the room instead of the center. As the water droplets get larger, they gradually form a circle. mushroom shape. The fortress is crystal clear and reflects the light. As the water droplets grow, they collapse and distort, becoming flat and crumbling. Until the tension of the water droplets reaches the limit, they will collapse instantly and lose everything.