If the temperature of the water in the cup is much lower than the air temperature, then the outside temperature continues to rise and the water in the cup is likely to rise. Of course, the temperature is not necessarily equal to the outside air temperature, but it will usually be close to or lower than the air temperature.
If the water in the cup is originally higher than the temperature and the outside temperature rises to a certain level but does not reach the temperature in the cup, then the temperature water in the cup will not increase, but will decrease below the temperature.
Tell me more. If the temperature you are talking about refers to the water vapor burning in the pan, even though the temperature does not increase when it reaches 100°C, it still burns and heats up. The temperature of a bowl of steamed water in the pot will then reach 100°C! Not below thetemperature, not below 100°C.
Why does the water at the bottom of the cup cool faster than the water at the top?
Think of a problem. One end of a dry towel is placed in a cup filled with water. As a result, the dry towel becomes wet. It is true that the position of part of the towel dries. Water increased and potential energy increased. But potential energy is not generated out of thin air, various forces in the capillary phenomenon do work, which is the reduction of energy in the capillary.
Our hydroelectricity is generated by water evaporated by the sun in the sky, turning into rain and falling back to the earth to form streams. Ultimately, the sun is constantly generating energy. The corresponding different energies in the capillaries cannot be generated continuously like the sun. Even capillary action in perspirationration of plants is due to constant exposure to the sun.
In short, when the capillary phenomenon occurs, the surface energy of the capillary is converted into the potential energy of the water. If you want to convert the potential energy of water into electrical energy, you must overcome the surface area. Energy (like blowing air into the capillary appropriately, just overcome the surface energy so the water can flow), energy is conserved.
We should think carefully about how to obtain potential energy from “water raised by capillary action”? You might say you can just use gravity, but remember that water is pulled by surface tension. We therefore still have to overcome these potential surface energies! The result is of course: a perpetual motion machine cannot be built!
After pouring the newly boiled water intos the cup, there is white foam floating on the surface of the water, and it is still spinning, and the speed is relatively fast, I hope someone. can you give me an answer!
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In fact, in a glass of water, the temperature of the water will not differ much. After all, the glass of water is too small, so it will be. doesn't change much. If we compare the water to the sea, the sea temperature is very different. Everybody knows it.
In the sea, the temperature on the water surface is higher than the temperature underwater, because when the sun shines on the sea, the water above evaporates easily and water absorbs heat. Although the specific heat capacity of water is very large, but after a day of exposure, the temperature will further increase to a very high temperature. The water at the bottom of the sea is extremely cold. Part of the bottom is frozen. There is no sun there, and even the sun does notcan't shine that far. will know that the bottom of the sea is extremely cold. For example, I was going to the beach to play, and being close to the sea, the water next to it is not very cold. If you swim harder in the sea, the water there will become colder and colder and you will be able to touch the deeper seabed.
? Of course, this is due to sunlight. This is rarely the case with water cups. Generally, water cups are made of transparent glass, and sunlight only interferes with their characteristics. some water. Anyone who has studied physics knows that the density of water is actually neither too large nor too small. It is generally used to make a standard. The density of water is different depending on the temperature.
?It seems to me that the density of water seems to be 4 degrees when it is densest. As the temperature increases or decreases, the temperature will slowly decrease. Those with high density havetend to be at the bottom, and those with low density tend to be at the top. Those with high density tend to have a relatively low temperature, while those with low density have a relatively high temperature and are at the top. This situation causes the bottom of the water glass to be very cold, while the temperature above it is relatively high. Water absorbs temperature from everywhere. As we all know, water has no shape, is fluid and has pressure inside. When the water outside absorbs heat, it floats to the top, and the water that does not absorb heat only sinks. down.
This situation is like water in a stream, almost the same thing.
1. The white substance is tartar. It is originally denser than water, but due to the surface tension of water, it floats on the surface of the water.
2. Heat transfer between water and air makes the surface temperaturee incoherent water. The density of water increases where the temperature is slightly lower, so it goes down. During the sinking process, surrounding water flows out to replenish it. Due to the unbalanced force at the center of the sinking, the water surface rotates and forms a vortex. It's a bit like the cause of a tornado, but downwards. In this way, relatively stable convection is formed, so that the heat dissipation of the water continues in this way. The scale is washed away because the particles are very small. Once it enters the water, it sinks and disappears.