0 Members and 1 Guest are viewing this topic.
Nucleation doesn't only require a foreign particle. Nucleation by movement is often observed when supercooled water freezes as frost on a car roof.
Microwave absorption does not depend on convection so is less likely to invoke boiling nucleation as the water is heated relatively uniformly throughout its bulk or even top-down, unlike a conventional cooker.
there's a mechanism in superheated water by microwave which is not available in other heating methods?
Quote from: hamdani yusuf on 20/04/2022 11:53:56 there's a mechanism in superheated water by microwave which is not available in other heating methods?You have not provided sufficient evidence to convince anyone of that claim.
Quote from: hamdani yusuf on 15/04/2022 05:59:07Now I've done recording the experiments. These are what I did.1. Heat demineralized water in the borosilicate beaker in microwave oven until some bubbles are formed. Then test if it's superheated using a steel fork.2. Reheat the water using microwave oven, and repeat the test.3. Reheat the water using infrared ceramic stove until some bubbles are formed, and repeat the test.4. Reheat the water using infrared ceramic stove until some bubbles are formed, and repeat the test.5. Compare the results to determine if they are produced by the same phenomenon.Now I've done editing and uploaded it.//www.youtube.com/watch?v=UmOT02wkeDAComparison with Infrared Stove
Now I've done recording the experiments. These are what I did.1. Heat demineralized water in the borosilicate beaker in microwave oven until some bubbles are formed. Then test if it's superheated using a steel fork.2. Reheat the water using microwave oven, and repeat the test.3. Reheat the water using infrared ceramic stove until some bubbles are formed, and repeat the test.4. Reheat the water using infrared ceramic stove until some bubbles are formed, and repeat the test.5. Compare the results to determine if they are produced by the same phenomenon.
Why infrared stove fails to produce superheated water?
What kind of evidence is sufficient to convince you?
Superheating is a hit-and-miss phenomenon.
Quote from: Bored chemist on 20/04/2022 19:40:43Superheating is a hit-and-miss phenomenon.No. I can produce it consistently using microwave, 10 out of 10 if needed. What I need are demineralized water and smooth surfaced glass container.
Quote from: hamdani yusuf on 21/04/2022 02:49:46Quote from: Bored chemist on 20/04/2022 19:40:43Superheating is a hit-and-miss phenomenon.No. I can produce it consistently using microwave, 10 out of 10 if needed. What I need are demineralized water and smooth surfaced glass container.Then why can't you produce it with an IR source?Is it because you are only heating the bottom of the jug (The IR won't go through the glass) rather than the bulk of the water (as you do with microwaves)?
At this point, is there anyone still doubt that there's a mechanism in superheated water by microwave which is not available in other heating methods?
So we can see that practically none of the radiation is shorter than about 2 microns (where it would get through the glass jug).And the peak is at about 4 microns- which is where your spectrum of borosilicate shows that it absorbs strongly.And this is why I keep saying you should learn some science.
No. What you have demonstrated is that microwave heating of very clean water in very clean glass may not have sufficient nucleation triggers to prevent superheating.
Why infrared stove fails to produce superheated water? Because the infrared stove heats the bottom of the container and thus generates much stronger convection currents than are present with microwave heating. Convection = movement = nucleation.
I find this site quite informative
Quote from: hamdani yusuf on 22/04/2022 10:50:01I find this site quite informativeThen, since that site tells you the IR from a ceramic heater is mainly near 3 to 10 microns, why did you say that borosilicate is transparent- even though you showed a spectrum which tells you it is opaque ?
Do you think gas stove will give better result?
How much is reflected instead of absorbed?
The spectrum would be different than black body radiation
And again...Why do you refuse to learn science?
The answer is "not much" that's why I ignored it.https://en.wikipedia.org/wiki/Fresnel_equations#
How different?
Again it would be helpful if you learned the science that was available a hundred years ago.
When was the microwave oven invented?