Why use the induction cooker to boil water, when it is open, it will emit a loud noise?
When the bubble rises to low temperature, some water vapour bubble inside and condenses into water, the external pressure is greater than the pressure in the steam bubble, then the bubble volume gradually decreased. On the process of heating, air bubble and expansion is more and more, more and more big. But when the bubble rises to the lower temperature when the bubble water vapor also condenses into water, the volume gradually decreases. So in this process, with the increase of temperature, while the volume of bubble expansion while shrinking, and continue to rise, will produce a vibration of the vibration. If the frequency of the natural frequency and the same kettle, it will produce resonance sound. In addition, there are still bubble out of the water, the water in the kettle without pressure in the space of gas increases, will be a part of the gas squeeze The gap between the pot body and discharged from the kettle cover, will produce sound, with the increase of temperature, the water ran out of the bubble pressure increased, increasing the voice will become increasingly large. Because of these two reasons, then we would hear the sound of the water, the water and the sound is more and more important this is a sound. The water does not boil at
The water began when heated at the bottom of the kettle have some small bubbles, these small bubbles is dominated by adsorption at the bottom of the pot and dissolved in the water of the air bubble in the formation. But the air contains water vapor, but also because the heat generated, with the increase of temperature to the bubble in the evaporation of water vapor it gradually increased, the volume and pressure will increase, rising from the bottom up under the action of buoyancy.
Caused by vibrations caused by bubble rupture.
