Why is the sound of hot water different from cold water poured into a cup?

Water varies in temperature and density. The most common phenomenon is the ocean currents that are active in the ocean all year round.

Part of the currents are caused by the temperature difference between warm and cold water in the ocean. Temperature also affects the viscosity of water. Hot water has a low viscosity and active molecules, making it easier to produce more and larger bubbles, and the sound frequency when the bubbles burst is lower.

Temperature has a greater effect on the viscosity of water than density. The viscosity change is more pronounced in thicker liquids, such as honey, and less pronounced in water streams.

The sound of watering is made up of three types of mixtures: the sound of water (mainly from bubbles), the resonance of the air column in the remaining space of the container, and the vibration of the container and the body of water. In the sound of pouring cold water, the vibrations of the container and the water are the strongest, while in the hot water, the resonance of the air column is more dominant, but the principle behind this remains to be studied.

However, the sound spectrum of cold and hot water watering shows that all else being equal, the overall frequency of the sound is similar, but the intensity distribution is different. Water molecules.

The fluidity is much greater, the force of attraction between them is much less, and the evaporation rate of water molecules is fast, so there is always a layer of water vapor around the boiling water.

When boiling water is poured into the cup, some of this water evaporates quickly as soon as it touches the bottom of the cup. The water vapor at the bottom of the cup forms an air blanket between the boiling water and the bottom of the cup, and the sound of the collision is even lower. Cold water will not vaporize when it enters the cup, and the sound will naturally be more crisp.

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This is because the temperature of hot water and cold water is not the same, so the density is not the same, the weight is not the same, and therefore the sound of the collision is not the same.

Because the water molecules are different, and it is very likely that they will arrive at different speeds, because the water flow hits the bottom of the cup and produces a vibrating sound.

Because the vibration caused by the impact of the water flow is different, and the heating is uneven, the sound is different.

This is because:When you knock on a cup with water, the sound is generated by the vibration of the cup and the water, and when you hit a cup with a lot of water, because the more water, the less the vibration frequency of the air column formed in the cup, so the sound is low and deep.

When you hit a cup with less water, because there is less water and the air column is long, the frequency of the air column is very small, and the water and the cup play a leading role, so the sound is crisp and bright.

Principle: The speed at which sound travels in different media is also different. The propagation speed of sound is related to the counter-equilibrium force of the medium, which means that when a molecule of a substance deviates from its equilibrium position, the surrounding molecules will squeeze it back into the equilibrium position, and the greater the counter-equilibrium force, the faster the sound will propagate.

The propagation of sound, like the propagation of light, is reflected and absorbed when it encounters obstacles. Hard, smooth surfaces have a noticeable reflection effect on sound. Soft, rough, porous surfaces absorb sound.

Add water to the cup, the sound will definitely change, and depending on how much water you add, his voice will be different, the sound is by vibration to make a sound, you add water, the vibration will be transmitted to the water, the sound in the water, where there is water in the water, the sound, will change, I remember which program there is? It is to put water in a cup, put different water, you can raise it until you spit out different **, that is quite good, if you want to listen, you can try it yourself, prepare a few more cups, and then put different water on them, one least, and then add it little by little, and it will definitely make different sounds when it is in the super cup.

Before filling the water, the inside and outside of the cup are air, and the walls of the cup vibrate naturally, producing a natural vibration frequency.

After filling with water, the cup is water, the pressure of water on the inner wall of the cup is stronger than the pressure of air on the outer wall of the cup, when the wall of the cup is vibrated by force, the inward amplitude is affected by the resistance of water pressure and is less than the outward amplitude, so the vibration frequency decreases, and the sound emitted becomes weaker. The length of the air column is different, the frequency of vibration is different, so the tone is different.

The reason for the sound generated during the filling of the thermos is that the sound is generated by vibration

When you pour water into the thermos, there is a sound, so something must be vibrating. When water is poured into the bottle, the water collides with the wall of the bottle, and the slight deformation of the wall causes the bottle to vibrate, resulting in a sound. But that's only one aspect.

Another aspect is that while the water is entering the bottle, the water itself is also splashing around, which also causes the air in the bottle to vibrate.

Precautions for the use of thermos cups

1. Before the use of new products, they must be sterilized with boiling water at high temperature to achieve the effect of killing bacteria.

2. Before use, please preheat with boiling water for 5-10 minutes to make the insulation effect of the reed better.

3. When cleaning, it should be cleaned with a soft cloth, not with wire.

4. Some red rust spots sometimes appear on the inside of the stainless steel cup, which can be fully cleaned with warm water and toothpaste.

5. In order to prevent the generation of peculiar smell or stains, and can be used for a long time. After use, rinse well and allow to dry thoroughly.

6. Don't make tea or drinks. The thermos cup is best used simply for drinking water, and avoid making tea, beverages, dairy products, traditional Chinese medicine, etc.

Because the composition of water changes when heated, the sound is different.