PPT Slide

Physics 9B Heads-up

9A Mechanical Systems Energy Conservation

9B Gas and Other Thermo Systems Energy Conservation

AKA “1st Law of Thermodynamics”

Sum of all KE and internal PE of gas molecules.

E.g. lifting a box of gas to a new height does

not increase the PEint

Q represents heat

into the system.

W represents work

done BY the system

This annoying sign convention on W

is very common in physics and chemistry texts. Be warned!