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Diathermal / adiabatic
Walls between the system and surroundings are called diathermal if they permit energy flow in or out
3 “ISOS-” and “ADIA-”• Isobaric – a thermodynamic process that takes
place at a constant pressure• Isochoric – a thermodynamic process that
takes place at a constant volume• Isothermal - a thermodynamic process that
take place at a constant temperature• Adiabatic - a thermodynamic process in which
Q = 0
Thermodynamic processes:
• Isothermal T = const ΔU• Isochoric V = const W • Adiabatic Q• Isobaric P=const
Isothermal
1st Law of Thermodynamics
Note : in case of phase change internal energy changes even if temperature does not.
a) U increases through heat
b) U increases through work
c) U decreases through heat
d) U decreases through work
2nd Law of ThermodynamicsEntropy – the measure of a system’s disorder
2nd Law: All natural processes lead to increase of entropy of the universe.
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