Download Thermo Equilibrium Essay - Dyno Guzman`s Digital Portfolio

Dinka & Dyno
10/08/09
10
Law Thermodynamics
What is thermodynamics? Thermodynamics is the study of the conversion of
energy into motion and or heat and its relation to macroscopic variables such as
temperature and pressure. In Greek Thermodynamic means Heat and Power.
Through out history, thermodynamics develop to increase the efficiency of early
steam engines.
The zeroth law of thermodynamics is a generalization about the thermal
equilibrium among bodies, or thermodynamic systems. It results from the definition
and properties of temperature.
The first law is the law of conservation of energy in short form is, where dU
is the increase in internal energy of the system, δQ is the amount of heat energy
added to the system and δW is the amount of work done by the system on its
environment. The heat term can cover a large number of processes, including heat
added by new particles entering the system. The symbol δ represents the fact that
because q and w are not state functions, δq and δw are inexact differentials.
The second law shows that in which intensive thermodynamic properties,
such as pressure, temperature and others, have a tendency to equalize as time
goes or where S is the entropy of the system. The entropy is generally related to
the heat term by dS = δQ / T
The third law of thermodynamics states that at the absolute zero of
temperature, the entropy is at a minimum and all thermodynamic processes cease.
The fourth law of thermodynamics is not yet an agreed upon law historically,
however, the Onsanger reciprocal relations have been frequently referred to as the
fourth law.
The applications for thermodynamics make use of the Second Law without
directly measuring or considering entropy change in a total isolated system. This
approach to the Second Law is widely used in engineering practice, environmental
accounting, systems ecology, and other usage.