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Questions tagged [conductivity]

A material's ability to conduct electric current or thermal energy by any means.

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How do I create a highly conductive vapor cloud [closed]

I'm working on a project that requires that I create an electrically conductive gas cloud that can conduct voltages as low as 1.5v from a regular double A battery. I've been looking into using mecury ...
TechDroid's user avatar
11 votes
5 answers
4k views

Why don't room temperature superconductors exist?

It seems like high-temperature and low-temperature superconductors are not too rare. But, why don't any superconductors work at room temperature? No theories seem to predict their occurrence, but none ...
user145708's user avatar
5 votes
0 answers
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Is there such thing as metallic helium?

I know that hydrogen can behave as a conductor under high pressure (metallic hydrogen); however could helium behave similarly under high pressure? If so, could this have any potential benefits over ...
Nitrogen-8's user avatar
1 vote
1 answer
51 views

What exactly is the area used in the equation R=ρl/A to find the resistance of an electrolyte?

My textbook says the resistance $R$ of a water column filled with some electrolyte is $$R=ρl/A,$$ where $ρ$ is the resistivity, $l$ is the distance between the electrodes, and $A$ is the area of cross ...
Shivang Thakur's user avatar
8 votes
1 answer
710 views

What happens to an ongoing electrolysis when you turn off the battery?

Suppose you do an electrolysis experiment, where you have two carbon electrodes, a battery, and water in a which a strong electrolyte, like NaCl, is dissolved. The circuit is closed and the ...
dark_ursus's user avatar
7 votes
0 answers
102 views

How does graphite content affect the conductivity of pencil lead?

My peers and I started an experiment to test whether we could use the conductivity of a piece of pencil lead to determine its grade (that is, whether it is 2H, HB, 3B etc.). The paper Observational ...
Jonathan Huang's user avatar
0 votes
0 answers
34 views

How to coat stainless steel?

I am trying to coat stainless steel with carbon black. I am using Polyvinylidene fluoride PVDF 2% as a binder. I dip and I heat at 100C. The coating that comes out is very fragile where you can blow ...
Anwer Ak's user avatar
0 votes
1 answer
106 views

Charge as a function of time in electrolysis

According to Faraday's laws of electrolysis, $\frac{Q}{Z}$ = no. of moles of substance released (n), where Z is n-factor x 96500. Assuming the electrolyte is a strong electrolyte, specific ...
chocolate kiwi's user avatar
2 votes
0 answers
90 views

What is the ionic conductivity of the hydroperoxide ion?

Hydrogen peroxide is supposed to dissociate as $$\ce{H2O2 <=> H+ + HO2-}$$ But I can't find a source for the conductivity, $\lambda$, of the hydroperoxide anion $(\ce{OOH-}$ or $\ce{HO2-})$ on ...
HiddenBabel's user avatar
-3 votes
1 answer
122 views

Constituents of LaI2 [closed]

An ionic solid $\ce{LaI2}$ shows electrical conduction due to presence of which anions and cations?
WATCHER's user avatar
1 vote
0 answers
43 views

Thermal conductivity and diffusivity of diatomite (also known as diatomaceous earth or kieselguhr) [closed]

Does anyone know where can I find measured thermal conductivity and thermal diffusivity of diatomite for different temperatures? I'm looking for the temperature dependency for temperatures higher than ...
Bambino005's user avatar
-1 votes
1 answer
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Study of superconductivity from organic compounds

What advancements have been made in understanding and applying organic superconductor materials? Although traditionally superconductivity has been studied in inorganic materials, are there any organic ...
Jorge Bonifaz's user avatar
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0 answers
60 views

Can we add specific conductivities at any concentration?

Suppose we have specific conductivities of $\pu{0.1 M}$ $\ce{K+}$ and $\pu{0.1 M}$ $\ce{Cl-}$. Can we add their specific conductivities to get specific conductivity of $\pu{0.1 M}$ $\ce{KCl}$?
McArthur's user avatar
1 vote
1 answer
154 views

How do the ions in electrolytes lead to lower dielectric constants compared to pure water?

I am interested in the salts used in the gel electrophoresis buffers. As I understand it, one of their roles is to change the conductivity of the medium, because otherwise the electric field would be ...
iRove's user avatar
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will adding metal nano particles to a CNT-polymer matrix increase the conductivity of the polymer?

I was wondering would just physical mixing of metal nano powders with MWCNT in a polymer matrix improve the conductivity of the said polymer? Would the metal particles interact with the CNT network. I ...
assasinchop7's user avatar
1 vote
1 answer
78 views

What has caused a plateau in the lead up to the equivalence point of a conductometric titration?

In a titration of HCl against NH3OH, conductivity had increased in a linear fashion (think y=x), and before it approached the equivalence point, there was approximately 0.8mL of 'plateau'. Before ...
ja10's user avatar
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Why is the conductivity of NaCl, NaBr and NaI decreasing with temperature?

I collected the conductivity of NaCl, NaBr, and NaI from 30 celsius to 80 celsius. I used the solutions mixed in water. In all instances, the conductivity seemed to reduce as the temperature increased....
Indra's user avatar
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What is the highest temperature, ambient pressure type-1 superconductor as of 2022?

I was curious about the highest known Tc for type 1 superconductors. This list suggests lead near 7K is as good as it gets for type-1 superconductors but I wonder if that is true given the current ...
Sidharth Ghoshal's user avatar
1 vote
1 answer
175 views

On the definition of Molar conductivity

The textbook I follow defines the conductivity, $\kappa$, as $$\text{Conductance} \ G=\frac{1}{R}=\kappa \frac Al$$ The inverse of resistivity, called conductivity, is represented by the symbol $\...
insipidintegrator's user avatar
0 votes
1 answer
541 views

Degree of dissociation and conductance

My book says ratio of molar conductance at a given concentration of solute and molar concentration at infinite dilution is equal to degree of dissociation for weak electrolytes. I understand it ...
Gaurav's user avatar
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0 votes
1 answer
188 views

How can we define molar conductivity as the conductance of 1 ml of electrolytic solution?

I've been taught that conductance ($G$) of an electrolytic solution is the inverse of the resistance of the solution, and conductivity ($\kappa$) is the inverse of the resistivity. From this, we have $...
Righter's user avatar
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2 votes
4 answers
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What non-toxic non-corrosive liquids are used for heat transfer?

I have a steel vessel placed concentrically within a larger steel vessel, resulting in air-filled annulus (air gap) between the two vessel walls (figure below). Due to the existing vessel construction,...
Armadillo's user avatar
  • 187
3 votes
1 answer
364 views

Why do we define molar conductivity?

I've learnt about conductivity and molar conductivity in school. I know that conductivity is the conductance of a solution of unit volume/ of unit cross-sectional area and distance between the ...
anon's user avatar
  • 215
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0 answers
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Continuous measurement of urea concentration in water

My colleague and I are working with fertilizers, and we are trying to continuously measure the concentration of urea in water (In situ concentration as function of time). There are two condition that ...
Tensor's user avatar
  • 264
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2 answers
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Electrical conductivity of a NaOH solution

We are doing a simple water electrolysis experiment but I have issues with the electrolyte solution. Took 450ml of distilled water and slowly dissolved 50g of NaOH until heating ceased. If I'm not ...
Lorenzo Marcantonio's user avatar
2 votes
2 answers
348 views

Conductometric titration curve plotting

In the conductometric titation of HCl vs NaOH, the conductance initially decreases, reaches a minimum at equivalence point, and then the slope of the curve becomes positive: Source: https://chart-...
Shub's user avatar
  • 408
6 votes
0 answers
179 views

Why is the rubber tip of my capacitive stylus no longer conductive?

In 2014, so eight years ago, I bought five styluses from China. Cheap stuff obviously. They worked fine while I used them, but soon after they were just left in a drawer. Last night I realized that ...
Mads Skjern's user avatar
4 votes
0 answers
87 views

Linearity of electrochemical cells and electrical conductivity measurement

I've measured the output signal of a few commercially available conductivity meters and was surprised to see that the signal was typically a square wave of amplitude in the range of 1.5 to 6 Vpp (peak-...
Likely's user avatar
  • 41
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0 answers
28 views

What is the net gain of charge carriers in a semiconductor if an atom is removed?

In pure germanium, all Ge atoms are bonded with a tetrahedral geometry. It has a band gap and is a semiconductor. If we remove one Ge atom, what type(s) and how many charge carriers will be generated? ...
rwang's user avatar
  • 1
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0 answers
384 views

Why is polystyrene (PS) an electrical insulator

The reason behind why graphite is electrically conductive is as ancient as the age of the Queen: that, electrons inside the benzene ring are delocalised. However, if one looks the repeating unit of ...
joshua mason's user avatar
1 vote
0 answers
21 views

Descriptive explanation of different Carbon Nanotubes Conductivity

I'm soon having a talk about Carbon Nanotube FETs and wanted to give a short introduction into CNTs in general. Of course for device operation it's important that some types of single-walled CNTs are ...
Mika R.'s user avatar
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0 answers
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Commercially available conductive polymers

I am looking for intrinsically conductive plastics (not plastics that are made conductive by filling them with carbon black for example). I have found that there are conductive polymers like ...
x3b7z99's user avatar
  • 151
5 votes
1 answer
425 views

Molar conductivity calculation in a titration curve

At an exam for analytical chemistry, I was asked to calculate the molar conductivity of a solution for an ongoing titration. I just solved it the way our professor showed it to us but I have some ...
Mäßige's user avatar
  • 127
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0 answers
24 views

Literature recommendation - non-stationary heat transfer in porous solids

I am trying to calculate a non-stationary heat transfer to a porous spheres by conduction. These spheres are placed in a thin metal tubes with a known heat capacity. Hot/cold air (or similar gaseous ...
Josh E.'s user avatar
  • 133
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1 answer
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Why does temperature increase rate of electrolysis even though resistivity of electrodes increase?

My experiment is just the electrolysis of iron rust at different temperatures. It consists of a rusted iron cathode and an iron anode in a salt water solution. From my data, there is an approximately ...
Alan Liu's user avatar
2 votes
1 answer
731 views

Why is 1413 µS/cm specifically the "standard" conductivity standard?

I'm doing some work on conductivity sensor calibration, and noticed that all the conductivity standard suppliers offer a 1413 µS/cm standard solution. Why is this oddly specific value the "...
Michael Molter's user avatar
2 votes
0 answers
87 views

Characteristics of metals compatible with semiconductor grade Ultra Pure Water (UPW)?

I am looking to build a water conductivity sensor for semiconductor grade Ultra Pure Water (UPW). UPW conductivity sensors already exist, but because of price and low water volume I need to fabricate ...
ericnutsch's user avatar
-1 votes
1 answer
68 views

Why doesn't NaCl work for electrolysis? [closed]

So I found out online that to increase the conductivity of water for electrolysis, NaCl or NaOH is used. However, upon using a low amount of NaCl in water and passing 12V through the solution, I ...
user avatar
0 votes
1 answer
679 views

Why is copper a better conductor of electricity than calcium?

How would we compare the electrical conductivity between copper and calcium? I understand that electrical conductivity of a metal is dependent on the number of delocalized electrons for that metal. ...
john's user avatar
  • 242
1 vote
1 answer
586 views

Is this true for conductivity of mixture of two solutions equal to the sum of conductivities of each solution?

Suppose $\ce{Na2SO4}$ has a conductivity $\pu{2.6 \times 10^{-4} S cm-1}$ and on mixing $\ce{CaSO4}$ to saturation, the conductivity becomes $\pu{7.0 \times 10^{-4} S cm-1}$. So, Is the conductivity ...
Mridul Kumar's user avatar
1 vote
0 answers
225 views

Ionic mobilities and conductivities of lithium and potassium cations in acetonitrile–propylene carbonate solution

Recently I calculated the ionic mobility and molar ionic conductivity values for $\ce{Li+}$ and $\ce{K+}$ cations in an acetonitrile–propylene carbonate binary mix solution (8:2 molar fraction ratio). ...
Ryksa's user avatar
  • 59
2 votes
0 answers
294 views

Why does conductivity of a solution of sodium in liquid ammonia decrease with a decrease in temperature?

What happens to the conductivity when a solution of sodium in liquid ammonia at $\pu{-33^{\circ}C}$ (Boiling point of ammonia) is further cooled? I expected the solution to behave as any other ...
Vamsi Krishna's user avatar
1 vote
0 answers
36 views

Can alkali-doped exohedral fullerene molecules show superconducivity?

Alkali doped fullerenes are one of the few organic materials that show superconductivity. However, when attaching a new molecular system to a fullerene doped with an alkali metal, will it still show ...
C-Consciousness's user avatar
19 votes
1 answer
5k views

Why does the graph of the electrical conductivity of sulfuric acid/water solutions have this knee in the ~85%-~92% range?

This answer to an earlier question regarding the electrical conductivity of sulfuric acid provides a graph showing the conductivity of sulfuric acid/water mixtures ranging from 0% to 100% sulfuric ...
Vikki's user avatar
  • 489
23 votes
3 answers
3k views

Is "Sulfuric acid... makes a poor electrolyte... very little of it will dissociate into ions" really true? What does that actually mean?

While researching chromate conversion coating for edits to this answer in Space Exploration SE, I came upon the following passage in Corrosion Resistance of Stainless Steel to Sulfuric Acid Sulfuric ...
uhoh's user avatar
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1 vote
0 answers
89 views

High symmetry points and x-coordinates

Is it possible to work out the x-coordinates related to high symmetry points? The software I'm using doesn't provide me with that, so I was wondering if there is a way to manually figure it out, as I ...
Janusz's user avatar
  • 11
1 vote
0 answers
100 views

Is there a relation between polarity of molecules and their electric susceptibility?

So it is written in our text that electric susceptibility ($χe$) (the response of say water molecules in the presence of an external electric field) is related to the molecular behaviour of various ...
Krishnaraj PT's user avatar
6 votes
1 answer
186 views

How exactly does electrolysis occur if the molar conductivities of cation and anion are different?

I'm having trouble wrapping my head around Kohlrausch law of infinite dilution and molar conductivities in general. For a salt $\ce{AB}$ the molar conductivity at infinite dilution can be expressed as ...
Vamsi Krishna's user avatar
2 votes
2 answers
810 views

Temperature Dependence of The Conductivity of Electrolytic Solutions

I have learned in my chemistry text books that the conductivity of electrolytic solutions increase with the increasing of temperature because the ions of electrolytic solution move faster by getting ...
Mohammad Hasibul Hossain Rafi's user avatar
1 vote
0 answers
118 views

Pressure vs electric conductivity in solids

If we apply pressure to a solid, does it change its electric conductivity? I am asking this because in 2020 they announced a superconductor at room temperature but under a pressure of 3/4 of the ...
Miss Mulan's user avatar

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