What is the absorbent performance of the sponge packing box?

In our daily life, we often see sponge Packing Box absorbent. Why? There are many small gaps in the sponge packing box, which are filled with air. when the pressure is pressed to absorb water, the sponge is pressed to discharge its own air. when the pressure is lifted, the original shape will be restored and the original air will be inhaled. On the one hand, the water is under atmospheric pressure, on the one hand, there is water pressure and high pressure will be balanced to the low pressure, then the sponge is relatively low on the surrounding pressure, so the water will enter the sponge, if you have carefully observed that the water in the sponge packing box will sink, then you will know that this is actually due to the influence of atmospheric pressure and gravity.

Water can soak things. Wet is the feeling of an object. In short, wet is a physical attraction. If you carefully observe a cup of water, you can see that the water sticks to the glass wall, and higher than the water in the cup, the shape of U-shaped. This is because the hydrogen in the cup is attracted by the oxygen in the air and continues to rise until the weight and attractiveness of the water are balanced. The finer the pipe, the more water will rise to achieve a balance, so the finer the pipe, the higher the climb. In fact, this phenomenon is the capillary phenomenon of the sponge packing box. Because of this capillary effect, water can be raised from the ground to the leaves on the top of a three hundred-foot tall tree.

The capillary action of the sponge packing box is the attractiveness of the liquid surface to the solid surface. When the capillary tube is inserted into the infiltrated liquid, the liquid level in the tube rises, higher than that outside the tube. When the capillary tube is inserted into the non-infiltrated liquid, the liquid in the tube drops, lower than that outside the tube. Towel absorbent and so on are Capillary phenomena. Place a drop of silver on the clean glass plate, which can be rolled out without being attached to the glass plate. Immerse a clean glass plate in mercury and take it out again. The glass is not attached with mercury. This kind of liquid does not attach to the solid surface is called non-infiltration.

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