Onsager relations
Authier, A.,

International Tables for Crystallography
(2013).
Vol. D,
Section 1.1.1.5,
p.

[ doi:10.1107/97809553602060000900 ]
to the properties of tensors
Let us now consider systems that are in steady state and not in thermodynamic equilibrium. The intensive and extensive parameters are time dependent and relation (

**1.1.1.3**) can be written where ...

Notion of tensor in physics
Authier, A.,

International Tables for Crystallography
(2013).
Vol. D,
Section 1.1.1.2,
p.

[ doi:10.1107/97809553602060000900 ]
...

The matrix of physical properties
Authier, A.,

International Tables for Crystallography
(2013).
Vol. D,
Section 1.1.1,
p.

[ doi:10.1107/97809553602060000900 ]
**1.1.1.5**. Onsager relations
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Let us now consider systems that are in steady state and not in thermodynamic equilibrium. The intensive and extensive parameters are time dependent and relation (

**1.1.1.3**) can be written ...

The matrix of physical properties
Authier, A.,

International Tables for Crystallography
(2013).
Vol. D,
Section 1.1.1.3,
p.

[ doi:10.1107/97809553602060000900 ]
σ entropy, respectively. Matrix equation (

**1.1.1.4**) may then be written:
The various intensive and extensive parameters are represented by scalars, vectors or tensors of higher rank, and each has several components. The terms ...

Notion of extensive and intensive quantities
Authier, A.,

International Tables for Crystallography
(2013).
Vol. D,
Section 1.1.1.1,
p.

[ doi:10.1107/97809553602060000900 ]
is an extensive quantity; the energy stored by a gas undergoing a change of volume d V under pressure p is . Pressure is therefore the intensive parameter associated with volume. Table

**1.1.1.1** gives examples of extensive quantities and of the related ...

Symmetry of the matrix of physical properties
Authier, A.,

International Tables for Crystallography
(2013).
Vol. D,
Section 1.1.1.4,
p.

[ doi:10.1107/97809553602060000900 ]
to the properties of tensors
If parameter varies by, the specific energy varies by d u, which is equal to We have, therefore and, using (

**1.1.1.5**), Since the energy is a state variable with a perfect differential ...