1. Laws of thermodynamics Thermodynamics

2. Laws of thermodynamics Thermodynamics – the study of heat and its conversion into mechanical energy

3. Laws of thermodynamics Absolute zero

4. Laws of thermodynamics Absolute zero – a theoretical temperature that cannot be attained in real life.

5. Laws of thermodynamics Absolute zero – is value is 0K on the kelvin scale, and negative two hundred and seventy three degrees on the Celsius scale. (-273 o C)

6. Laws of thermodynamics Temperature conversions K=T C +273 T C =K-273

7. Laws of thermodynamics First Law of Thermodynamics Heat added = change in internal energy + external work done by the system

8. Laws of thermodynamics First Law of Thermodynamics Q=  E + W Heat added Change in internal energy External work done by or on the system.

9. Laws of thermodynamics Example – A system consisting of a cylinder an piston has 1000J of energy added to it. The system does 250 J of external work. What was the change in the internal energy of the system.

10. Laws of thermodynamics Q=  E + W  E = Q-W=1000-250=750J