# metals's questions - Chinese 1answer

292 metals questions.

### -1 Can you connect a battery to metal and make it electrical? [on hold]

0 answers, 39 views electricity conductors batteries metals
I'm writing a book and I need to know if a "defense mechanism" in it would actually work. There is a fire escape ladder (made of metal) leading from a window. The house is completely barred on the ...

### Does electric field polarity matter for Taylor cone formation?

1 answers, 277 views electric-fields metals
For example in liquid metal ion source (LMIS), the positive electrode is wetted by gallium, which forms a Taylor cone towards the negative electrode and emits Ga+ ions. Would a Taylor cone still form ...

### 2 Why does nickel permeability decreases past 250 KHz?

0 answers, 19 views magnetic-fields metals
I found this graph of nickel magnetic permeability vs frequency,it start to drop at around 250 KHz.Why isnt the permeability constant at all frequencies? Can that frequency curve somehow be ...

### 2 Why do both these molten metals round in a crucible?

In one of my classes this past semester, we did a casting lab. In this lab we used an induction furnace which uses a coil to generate heat within the material. One of the things that I noticed, was ...

### 1 Even/odd number of electrons per primitive cell and conductivity

1 answers, 28 views electrons crystals metals
In this pdf it says Because the number of electron states in a Brillouin zone is twice the number of primitive cells in a Bravais lattice (the factor two comes from spin), the zone can be ...

### 2 Why are powdered silver and powdered platinum black?

The quantum-mechanical (relativistic) explanations for the observed colours of copper, silver & gold don't appear to explain the black colours of powdered silver (& powdered platinum). Can ...

### 2 What is the significance of the time $\hbar/E_F$ where $E_F$ is the Fermi energy?

For free electrons in a metal, the Fermi energy $E_F$ (defined as the highest filled energy level at $T=0$). It represents a characteristic energy scale of the system as well as the energy of the ...

### 3 Why do thermal hotspots in a metallic nanoparticle do not match it's optical hotspots?

I am a little bit confused here. When a metallic nanoparticle is impinged with light at its resonance, the electric field is greatly enhanced at the surface along the polarisation of the wave(suppose ...

### Any metal or chemical or any thing which repels Iron

I on a project, i required a metal/chemically treated metal/Chemical/anything which repels iron and steel like two same side magents do. I searched in the internet and didn't found anything which ...

### 94 Why are most metals gray/silver?

Why do most metals (iron, tin, aluminum, lead, zinc, tungsten, nickel, etc.) appear silver or gray in color? (What atomic characteristics determine the color?) What makes copper and gold have ...

### 1 How does the color of fine dispersed metal particles change between silver and black?

Small dispersed particles of metals are often black, while a solid object of the same material would be some shade of silver. The most notable example is the use of metallic silver as the black color ...

### Why the electric field inside a metal sphere carrying a charge Q is zero?

I was solving some problem regarding the polarization during this I came across an example 4.5 in Griffith's where it is written that the Electric field inside the metal sphere carrying a charge Q is ...

### 8 Why is quicksilver (mercury) liquid at room temperature?

2 answers, 4.883 views physical-chemistry metals
This is a nice question when you find it out, and I am really looking for a proper answer. Take quicksilver (Hg) in the periodic table. It has one proton more than Gold (melting point 1337.33 K), and ...

### 2 Does corrosion of metals depend on electron degeneracy pressure?

Corrosion is about losing electrons for the corroded metal and gaining electrons for the oxidising substance. Is it correct to assume that what controls this process is the electron degeneracy ...

### 13 Why the electrons below the Fermi level do not conduct electricity?

Physically, why is it that the electrons need to excited above the Fermi level to conduct electricity? In other words, why is the current zero when the electrons lie below the Fermi level? Does Pauli ...

### 1 Equation of state for liquid metals (CFD Application)

I am currently looking for the Equation of state used for metals (fluid state) for CFD Application on metallurgy. Do you know a book where I can find them?

### raman tensor of graphène and its polarisability

I want ask about the raman tensor of graphene all that I know, the raman spectrum of graphene has 2 main peak G and 2D. but what about its tensor raman. I know that the metals materials don't have ...

### Is there a way to make infrared pass through metals?

I am curious to know a way that will make infrared pass through metals. Metals are good reflectors of infrared,can we manipulate the wave in order to make them pass through metals?.

### 2 How do liquid metals work?

1 answers, 37 views solid-state-physics metals matter
So in solid metals they atoms give off electrons, which are delocalised and hold together all the metal atoms. But that's not the case in liquid metals, right? What holds together the individual atoms ...

### 29 Is there a compound denser than the densest element?

3 answers, 36.752 views experimental-physics density metals

### -1 What is the name of metal-metal junction?

When two different metals come in contact, a junction at their contact is created. What is the name of that junction?

### -1 Is there any non-metallic oxide that remains in solid state at room temperature?

Except for metallic and semimetallic oxides, is there any oxide (non-metallic oxide) which remains in the solid state at room temperature?

### 2 How does the grain size effect on permeability and resistivity of a material?

If the grain size of a material varies, what does happen? Are the permeability and resistivity of the material changed with the variation of that grain size? If they do, how they do?

### 125 Why can I touch aluminum foil in the oven and not get burned?

4 answers, 26.265 views thermodynamics everyday-life conductors metals
I cook frequently with aluminum foil as a cover in the oven. When it's time to remove the foil and cook uncovered, I find I can handle it with my bare hands, and it's barely warm. What are the ...

### 1 Growth of iron crystals

What determines how large a crystal of iron will grow when heat and pressure are applied? I was thinking about the Earth's core. Some have postulated that a large iron crystal is at the center of the ...

### 2 What is the physics behind the vibrating feeling you get when you touched an inducted metal surface?

When I was last working on the highway, I stopped to help a motorist parked under high tension power lines. I'm driving a large Ford Transit van, fairly box shaped. My van was parked 90 degrees (...

### Why do mirrors look “gray”? [duplicate]

1 answers, 151 views optics visible-light reflection metals
Or any other silver surface? Perfect silver "colour" just seems to be "reflecting gray", so something that absorbs all wavelengths by the same fraction and reflects everything else specularly. When I ...