This topic, 1st law of thermodynamics, included:

• Work and Energy: https://thermodynamics-engineer.com/work-and-energy/
• Internal Energy and Enthalpy: https://thermodynamics-engineer.com/internal-energy-and-enthalpy/
• Energy Balance for Closed System: https://thermodynamics-engineer.com/for-closed-system/
• Engineering Devices of Steady Flow: https://thermodynamics-engineer.com/engineering-devices-of-steady-flow/

The above mentioned items have the corresponding sub items. Click the links and you will find them.

More items will come soon 🙂