(a) Define the following terms as used in thermodynamics: (i) Internal energy of a gas (ii) Isothermal process (iii) Adiabatic process [6 marks] (b) A fixed mass of an ideal gas occupies a volume of 2.5 × 10⁻³ m³ at a pressure of 1.2 × 10⁵ Pa and a temperature of 27°C. The gas is heated at constant pressure until its volume becomes 4.0 × 10⁻³ m³. (i) Calculate the final temperature of the gas. (ii) Calculate the work done by the gas during this process. [6 marks] (c) State TWO differences between an isothermal process and an adiabatic process for an ideal gas. [4 marks]