Question

Which one is true from the following for isobaric processes?
A) \[\Delta P=0\]
B) \[\Delta q=0\]
C) \[\Delta H=0\]
D) \[\Delta U=0\]

Answer 1

Hint: The symbol for representing pressure is P. Isobaric process means the process in which the pressure remains constant, thus the change in pressure for the process should remain constant. The symbolic representation of change in pressure is \[\Delta P\] .

Complete answer:
Here, we have been given that the process is isobaric, thus there should not be any change in the pressure of the process.
Now, as the pressure of the process should not be changed, the change in pressure should be zero.
The entity \[\Delta P\] represents change in pressure, and thus it should be zero. Option A matches with our requirement, and thus option A is the correct option.
Option B cannot be the correct option as it shows that the change in heat is zero.
Option C cannot be the correct option as it shows that the change in enthalpy is zero.
Option D cannot be the correct option as it shows that the change in internal energy is zero.
As \[\Delta P=0\] represents that the change in pressure of the process is zero, which is an isobaric process, similarly \[\Delta V=0\] represents that the change in volume of the process is zero, which is an isochoric process. And \[\Delta T=0\] represents that the change in temperature is zero, which is an isothermal process.
These three processes are used frequently in different thermodynamics applications.
And hence the correct answer is option A.

Note:
It is important to know the symbolic representation of pressure, without knowing its symbolic representation, you cannot find the perfect answer. Also, it is important to know that isobaric process means a process in which the pressure remains constant.