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1st Law of Thermodynamics

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by

Richard Datwyler

on 30 June 2014

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Transcript of 1st Law of Thermodynamics

Temperature (internal energy)
changes with work and heat flow

First Law of Thermodynamics

Heat flows in (+Q) Energy goes up
Heat flows out (-Q) Energy goes down

System does work (+W) Energy goes down

Work done on system (-W) Energy goes up
Dealing with the constants we call them
Many different types of processes, think of ideal gas law
Pressure, volume, temperature, heat flow, can all change or be constant.

Isothermal = constant Temperature
Isochoric = constant Volume
Isobaric = constant Pressure
Adiabatic = No heat flow
Say an ideal gas expands from .025 m to .75 m at the same pressure of 2.5 atm, what is the work done, and the heat flow?
If instead this same gas starting at the same pressure and volume expanded Isothermally instead of isobarically, what would the work and heat flow be?
Finally let us do the same expansion process but this time adiabatically. (we need either the number of moles or the initial temperature. Let us do the former n = 2.5 moles)
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