1. Mother of Invention A brief presentation on physics in a historical context.

2. What is Physics?  The human attempt to understand and model nature is arguably one answer to this question.  When considering human beings it is useful to reflect on motives and needs of individuals or their society.  Consider then the steam engine…

3. Conservation of Energy  First Law of Thermodynamics  Energy can be used to do work  Adiabatic Gas Law: PV=nRT  As temperature goes up the pressure or the volume must increase  In this case heat (energy) applied to water vapor leads to its expansion which can be used to do work (mechanical energy).  First Law of Thermodynamics  Energy can be used to do work  Adiabatic Gas Law: PV=nRT  As temperature goes up the pressure or the volume must increase  In this case heat (energy) applied to water vapor leads to its expansion which can be used to do work (mechanical energy).

4. “James Watt invented the steam engine.”

5. Hero’s Pneumatica  Lived in Alexandria in 1st century CE  Invented many pneumatic devices including a simple steam engine, a vending machine, as well “magic” doors for temples and animatronics.  Lived in Alexandria in 1st century CE  Invented many pneumatic devices including a simple steam engine, a vending machine, as well “magic” doors for temples and animatronics.

6. Hero’s Engine  Steam is heated and as it expands it leaves the vessel through two holes aimed tangentially from the center axis  The conservation of angular momentum results in the vessel spinning  Steam is heated and as it expands it leaves the vessel through two holes aimed tangentially from the center axis  The conservation of angular momentum results in the vessel spinning

7. Demonstration and Final Thoughts