Discussion
Which one of the following is an intensive property of a thermodynamic system?
Answer: B
The intensive property is density.
An intensive property does not depend on the size or extent of the system: if a system in equilibrium is divided into two parts, each part has the same value. Density is mass per unit volume, so halving the system halves both mass and volume and leaves density unchanged. Pressure and temperature are other examples.
Mass, energy and volume are extensive: they add up over the parts, so each half of the system has half the mass, half the energy and half the volume. Dividing an extensive property by mass gives an intensive one, which is why specific volume and specific energy are intensive while volume and energy are not.
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