Conductance is the ability of a material to allow the passage of current, fluid, or temperature, and is the inverse of resistance. It has various types, including electrical, fluid, thermal, membrane, and ionic conductance, each relating to different properties and measurements. Conductivity, an intrinsic property measured in siemens, does not change with the shape or size of the material.

1. Conductance

2. Definition and Importance
 Conductance is opposite of resistance; it is ability to allow passage of
current, fluid or temperature through a material
 It helps in analyzing property of material

3. Types of Conductance
 Electrical conductance:
Relation of electrical conductance with current and voltage
G= conductance; I = current; V=Voltage
Relation of conductance with area length and conductivity
= Conductivity
A= area of cross-section ; l= length of conductor

4. Types of Conductance
 Fluid Conductance : It is transfer of fluid through a medium
or region.
K = hydraulic conductivity; A = area of stream bed;
b = thickness of sediments
 Thermal Conductance: It is the measure of amount of heat
that is transferred through a material
Unit of conductance is W.K-1
Heat conducted is

5. Types of Conductance
 Membrane Conductance: It is dependent on permeability
of membrane. It is measure of ability of cellular membrane to
transfer ion.
Ix = trans-membrane current; gx = conductance of membrane;
Em = membrane potential; Ex = Nernst potential
 Ionic Conductance: It is conductance through solution
containing ions in solution.

6. Conductivity
 Inverse of resistivity
 It is an intrinsic property
 It does not change with change in shape or size of material
 Unit of measurement is Siemen/cm
 1 Siemen = 1 Amp/ 1Volt

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