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Specific Conductance Definition

Specific Conductance is the ability of a substance to conduct electricity. It is the reciprocal of specific resistance. Conductance means the flow of current through the liquid conductor. Specific conductance is defined as the conducting capacity of a solution of the dissolved electrolyte and the whole solution is being placed between two electrodes are 1 sq. cm and length 1 cm.

Specific Conductance

  • It is denoted by ? (Kappa).
  • It is the reciprocal of resistivity(⍴).
  • It is also known as Conductivity.
  • Ohm’s Law states that the resistance of any substance is directly proportional to its length and Inversely Proportional to its area. So, Ohm’s Law can be expressed as follows-

Specific Conductance - JEE
From (1) and (2)
Specific Conductance - JEE

⍴: Specific Resistance
l: length
A: Area of cross-section
R: resistance
Specific Conductance - JEE

Note:
When l = 1 cm
A= 1 cm2
Then  ⍴=R
Hence,
Specific resistance (or resistivity) of a conductor can be defined as the resistance of the conductor having a length of 1 cm and a cross-section area of 1 cm2.

Specific Conductance Formula

Specific Conductance - JEE
Specific Conductance - JEE
Specific Conductance - JEE

Unit of Specific Conductance

Specific Conductance - JEE
Unit of Area = cm2
Unit of length = cm
Unit of conductance =  Ω-1
Specific Conductance - JEE

Unit of ? = cm-1-1
Also the unit of conductance =  Ω-1 = Seimen
Then, Unit of (specific conductance) = Seimen cm-1
So, the unit of specific conductance is cm-1-1 or  Seimen cm-1.

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