Question

Properties of substances like pressure, temperature and density, in thermodynamic coordinates are
A. Path function
B. Point function
C. Cyclic function
D. Real function

Answer 1

Hint: We are given some properties of substances like pressure, temperature and density and are asked to find what type of function is it in a thermodynamic system of coordinates. State function or point function and path function are the two thermodynamic functions.

Complete step by step answer:
In the question we are asked that properties of substances like pressure, temperature density in thermodynamic systems are what type of functions.
Here we know that pressure, density and temperature are only dependent on the state of the system. That is all these properties of substances are totally independent of the path taken to reach the state.
We know that when a property is independent of the path and only dependent on the state, that will be a point function or also known as the state function. All the properties of substances are a point function or a state function.
We know that pressure is the average force exerted by the molecules per unit area on the container of the walls and it does not depend on the path of the molecules.
Temperature is the measure of average kinetic energy of the molecules or the atoms in the system and it will measure only the state of the system irrespective of how it reached that state.
Density is the measure of the mass of the molecules per volume in a system and it is also irrespective of the path followed.

So, the correct answer is “Option B”.

Note:
Path function is a quantity whose magnitude will depend on the path followed during the process. That is a path function is based on how the state of the system is established. Work, heat etc are some of the examples for path function.