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Across 4. Internal energy is an __________________property 5. SI units of energy 6. Refractive index an __________________ property 7. Energy required to increase the temperature of 1Kg of water by 1 degree is its _______ 9. For an expansion process work done is ______________ 10. Melting of water is ___________ change 13. System that cannot exchange energy and matter with the surrounding is a/an ________ System 14. Work done in free expansion of an ideal gas in vacuum is ______________ 18. ________________ is the line between a system and the surroundig 19. The system, surrounding together with boundary forms the _________________

Down 1. When the temperature of a process is constant throughout the change, then its __________ process 2. Heat transfer when system is in direct contact with surrounding 3. In an isothermal reversible expansion of an ideal gas ________is equal and opposite work done. 8. Combustion of methane is a _________________ change 10. Rate at which energy changes 11. Temperature and pressure are _______________ functions 12. In an isobaric process, _________________ is kept constant 15. Human cell is an example of ________________ system 16. Work and Heat are ___________________ functions 17. ______ is that part of the universe which is under study