[hamdani yusuf (OP)]

I show you how glass becomes conductive when heated

I also asked the author in the comment section.

What would happen if you use pure silicon dioxide glass?

[hamdani yusuf (OP)]

More about glass in this video.

Glass is one of the most important materials humans have ever made.

00:00 Glass and our place in the universe
01:23 How Gorilla Glass works
04:35 What is glass?
05:15 Is glass a liquid?
07:29 Different types of glass
09:59 Invention of transparent glass
11:56 Why is some glass transparent?
14:54 Invention of glass lenses
15:52 Development of magnification
18:02 How to make glass more durable

[hamdani yusuf (OP)]

This is like impedance matching problem in electronic engineering.

Ultrasound gel does amazing things to sound waves

I was curious about the purpose of ultrasound gel. It's really interesting so I built this wave machine to explain how it affects sound.

CORRECTION: when I calculate the efficiency of the ultrasound scanner without gel I come to a figure 1/10000%. But that would only be if there was a full on air gap. When pressed against the skin the situation is much less dire. The gel ensures a better acoustic coupling by preventing air gaps etc. Thanks to a couple of comments for pointing that out.

He also mentioned impedance and refractive index in the video.
Electrical impedance was generalization of electrical resistance in DC. Thus the real part represents the energy absorption or energy transformed into different forms.
On the other hand, refractive index was initially used to describe the behavior of light being bent by transparent media like water and glass. Thus the real part represents the material's ability to bend light.

[paul cotter]

As regards #1300, quartz(silica) needs nearly 2000c to melt and it has an mp as opposed to glass.

[hamdani yusuf (OP)]

As regards #1300, quartz(silica) needs nearly 2000c to melt and it has an mp as opposed to glass.

My follow up question is, does it become a good microwave absorber when it's hot?
As shown in some videos, normal glass can already absorb microwave before it melts.

[Bored chemist]

My follow up question is, does it become a good microwave absorber when it's hot?

What is stopping you googling that ?

" Comparing the transmission performance of mullite, alumina (Al2O3) and fused silica ceramics, it was found that the fused silica ceramics have excellent transmission properties; especially it is at high temperature. "
from
https://www.sciencedirect.com/science/article/abs/pii/S0272884218334746

[hamdani yusuf (OP)]

What is stopping you googling that ?

Asking Gemini is more convenient.

Fused silica is transparent to microwaves. This means that microwaves pass through it without being absorbed or significantly interacting with the material.
Here's why:
 * Low Dielectric Loss: Fused silica has a very low dielectric loss, which means it doesn't absorb microwave energy.
 * Non-Polar Material: Silica is a non-polar material, meaning its molecules don't have a permanent dipole moment. Microwaves interact with polar molecules, causing them to rotate and generate heat. Since fused silica is non-polar, it doesn't interact with microwaves in this way.
Implications:
 * Microwave Ovens: You can safely use fused silica containers in microwave ovens, as they won't heat up or interfere with the cooking process.
 * Microwave Applications: This transparency to microwaves makes fused silica useful in various microwave applications, such as windows for microwave ovens and components in microwave communication systems.
In summary, fused silica's transparency to microwaves is a valuable property that makes it suitable for applications where microwave interaction is undesirable or where it needs to be used in microwave environments.

[Bored chemist]

Asking Gemini is more convenient.

And yet, you were still too lazy to do it.

However, Gemini's reply seems to miss the critical point.
You can microwave your food in a glass dish.
It's only when the glass is very hot that it starts to absorb significantly.

So...
 as long as it isn't too hot...glass is transparent to microwaves. This means that microwaves pass through it without being absorbed or significantly interacting with the material.
Here's why:
 * Low Dielectric Loss: glass has a very low dielectric loss, which means it doesn't absorb microwave energy.
 * Non-Polar Material: glass is a non-polar material, meaning its molecules don't have a permanent dipole moment. Microwaves interact with polar molecules, causing them to rotate and generate heat. Since glass is non-polar, it doesn't interact with microwaves in this way.
Implications:
 * Microwave Ovens: You can safely use glass containers in microwave ovens, as they won't heat up or interfere with the cooking process.
 * Microwave Applications: This transparency to microwaves makes glass useful in various microwave applications, such as windows for microwave ovens and components in microwave communication systems.
In summary, glass's transparency to microwaves is a valuable property that makes it suitable for applications where microwave interaction is undesirable or where it needs to be used in microwave environments.

[hamdani yusuf (OP)]

However, Gemini's reply seems to miss the critical point.
You can microwave your food in a glass dish.
It's only when the glass is very hot that it starts to absorb significantly.

Not really. It answered my question specifically about fused silica.

[hamdani yusuf (OP)]

So...
 as long as it isn't too hot...glass is transparent to microwaves. This means that microwaves pass through it without being absorbed or significantly interacting with the material.
Here's why:
 * Low Dielectric Loss: glass has a very low dielectric loss, which means it doesn't absorb microwave energy.
 * Non-Polar Material: glass is a non-polar material, meaning its molecules don't have a permanent dipole moment. Microwaves interact with polar molecules, causing them to rotate and generate heat. Since glass is non-polar, it doesn't interact with microwaves in this way.
Implications:
 * Microwave Ovens: You can safely use glass containers in microwave ovens, as they won't heat up or interfere with the cooking process.
 * Microwave Applications: This transparency to microwaves makes glass useful in various microwave applications, such as windows for microwave ovens and components in microwave communication systems.
In summary, glass's transparency to microwaves is a valuable property that makes it suitable for applications where microwave interaction is undesirable or where it needs to be used in microwave environments.

The reason some glasses become electrically conductive and absorb microwave when heated is because the ions previously held tight in their position can then wiggle when the glass is hot enough.

[paul cotter]

When short of mica/vacuum capacitors for aerial(antenna) matching with am broadcast transmitters in the range of 1-10Kw I have used home made capacitors with alternate layers of aluminium and glass. Generally they worked well but if pushed a bit too hard they would start warming up and subsequently runaway into a fiery mess. They had the great advantage of being easily varied to achieve an optimum swr.

[Bored chemist]

However, Gemini's reply seems to miss the critical point.
You can microwave your food in a glass dish.
It's only when the glass is very hot that it starts to absorb significantly.

Not really. It answered my question specifically about fused silica.

Your question was about hot fused silica.

does it become a good microwave absorber when it's hot?

But the answer from the AI didn't mention that aspect.
Unless you specify that, there's not much difference between glass and fused quartz.

[Bored chemist]

The reason some glasses become electrically conductive and absorb microwave when heated is because the ions previously held tight in their position can then wiggle when the glass is hot enough.

We know.
What was your post for?

[hamdani yusuf (OP)]

The reason some glasses become electrically conductive and absorb microwave when heated is because the ions previously held tight in their position can then wiggle when the glass is hot enough.

We know.
What was your post for?

Because your previous answer in #1307 hasn't explicitly stated this information.

[Bored chemist]

The reason some glasses become electrically conductive and absorb microwave when heated is because the ions previously held tight in their position can then wiggle when the glass is hot enough.

We know.
What was your post for?

Because your previous answer in #1307 hasn't explicitly stated this information.

It also didn't explicitly state the best growing conditions for garlic.

[hamdani yusuf (OP)]

It also didn't explicitly state the best growing conditions for garlic.

What does garlic have to do with this thread?

[Bored chemist]

It also didn't explicitly state the best growing conditions for garlic.

What does garlic have to do with this thread?

Nothing, and that was my point.

There is an enormous amount of information in the world which I didn't need to include in that post.

[hamdani yusuf (OP)]

The reason some glasses become electrically conductive and absorb microwave when heated is because the ions previously held tight in their position can then wiggle when the glass is hot enough.

We know.
What was your post for?

I think my post above is necessary. Your post below seems to imply that ordinary glass doesn't contain trapped ions which would be loosened up when it's heated.

* Non-Polar Material: glass is a non-polar material, meaning its molecules don't have a permanent dipole moment. Microwaves interact with polar molecules, causing them to rotate and generate heat. Since glass is non-polar, it doesn't interact with microwaves in this way.
Implications:

[hamdani yusuf (OP)]

Jim Al-Khalili explores the history of thermal energy (thermodynamics).