Correct Answer - Option 1 : Volume and temperature both increases

__CONCEPT:__

Isobaric process:

- When a thermodynamic process undergoes a physical change in such a way that its pressure remains constant, then the change is known as the isobaric process.

⇒ P = constant

__EXPLANATION:__

⇒ P = constant -----(1)

- The ideal gas equation is given as,

⇒ PV = nRT -----(2)

Where P = pressure, V = volume, T = temperature, n = number of moles, and R = gas constant

By equation 1 and equation 2 for an isobaric process,

⇒ V ∝ T -----(3)

- By equation 3 we can say for an isobaric process the
**volume of the gas is directly proportional to the temperature**.
- In an
**expansion process the volume of the gas increases, so the temperature also increases**. Hence, option 1 is correct.