6. Which thermodynamic process has variable pressure and temperature, but constant volume? a. isothermal process b. isobaric process c. adiabatic process d. isochoric process 7. Which gas law states that in a system with a fixed volume, the pressure is directly proportional to temperature? a. Avogadro's law b. Charles' law c. Gay-Lussac's law d. Boyle's law 8. Which of these is the heat required to change a solid to liquid? a. heat of combustion b. heat of fusion c. heat of sublimation d. heat of vaporization 9. Which of these is a system that can exchange matter and energy with its surroundings? a. None of these b. Closed system c. isolated system d. open system 10. What is the formula that describes radiation as a form of heat transfer?

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First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.