The first law The Concepts C Stephen L. Davis, 2003
The First Law The Concepts © Stephen L. Davis, 2003
System and surroundings System-the part of the world in which we have a special interest Surroundings -where we make our system observations surroundings
System and Surroundings • System - the part of the world in which we have a special interest. • Surroundings - where we make our observations. system surroundings
ypes of systems Open -exchanges matter and Matter energy with surroundings Energy Closed-exchanges onl Energy energy with surroundings Isolated-no interchange with surroundings
Types of Systems • Open - exchanges matter and energy with surroundings. • Closed - exchanges only energy with surroundings. • Isolated - no interchange with surroundings. Energy Energy Matter
Heat Heat is the energy transferred between a hot object and a cold object ° Temperature is the degree of hotness of high an object
Heat • Heat is the energy transferred between a hot object and a cold object. • Temperature is the degree of “hotness” of an object. q Thigh Tlow
Isothermal vs. adiabatic An adiabatic process in one in which no heat is exchanged between the system and Its surroundings An isothermal process in one in which the initial and final temperatures are the same Isothermal processes are not necessarily adiabatic
Isothermal vs. Adiabatic • An adiabatic process in one in which no heat is exchanged between the system and its surroundings. • An isothermal process in one in which the initial and final temperatures are the same. • Isothermal processes are not necessarily adiabatic