Download presentation

Presentation is loading. Please wait.

Published byJewel Weatherly Modified over 2 years ago

1
Thermo & Stat Mech - Spring 2006 Class 4 1 Thermodynamics and Statistical Mechanics Does the Internal Energy of a Real Gas Depend Only on Temperature?

2
Thermo & Stat Mech - Spring 2006 Class 42 Change of Phase First Law is: du = đq – Pdv For a finite change at constant temperature u = q – P v At transition, u 2 – u 1 = l 12 – P(v 2 – v 1 ) l 12 = (u 2 + Pv 2 ) – (u 1 + P v 1 ) l 12 = h 2 – h 1

3
Thermo & Stat Mech - Spring 2006 Class 43 Enthalpy and Latent Heat Enthalpy is defined as: h = u + Pv

4
Thermo & Stat Mech - Spring 2006 Class 44 Enthalpy is a State Function

5
Thermo & Stat Mech - Spring 2006 Class 45 Does u depend on Volume? If u = u(T, v), then,

6
Thermo & Stat Mech - Spring 2006 Class 46 From Cyclical Relation

7
Thermo & Stat Mech - Spring 2006 Class 47 Gay-Lussac–Joule Experiment

8
Thermo & Stat Mech - Spring 2006 Class 48 Gay-Lussac–Joule Results

9
Thermo & Stat Mech - Spring 2006 Class 49 Joule-Thompson Throttling Process A gas passes through a constriction from a region where it is at high pressure to a region where it is at lower pressure. The gas expands, and the temperature of the gas can be lowered. This is an important tool in low temperature physics.

10
Thermo & Stat Mech - Spring 2006 Class 410 Joule-Thompson Throttling Process

11
Thermo & Stat Mech - Spring 2006 Class 411 Joule-Thompson Throttling Process On high pressure side: W i = – P i V i On low pressure side: W f = + P f V f Total work: W = P f V f – P i V i Q = 0 = U + W 0 = U f – U i + P f V f – P i V i 0 = (U f + P f V f ) – (U i + P i V i )

12
Thermo & Stat Mech - Spring 2006 Class 412 Enthalpy

13
Thermo & Stat Mech - Spring 2006 Class 413 Enthalpy

14
Thermo & Stat Mech - Spring 2006 Class 414 Enthalpy

15
Thermo & Stat Mech - Spring 2006 Class 415 Enthalpy True for ideal gas.

16
Thermo & Stat Mech - Spring 2006 Class 416 Ideal Gas

17
Thermo & Stat Mech - Spring 2006 Class 417 Joule-Thompson Throttling Process

Similar presentations

OK

Fig. 17-11 The net work done by the system in the process aba is –500 J.

Fig. 17-11 The net work done by the system in the process aba is –500 J.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on regional trade agreements signed Ppt on careers in psychology Ppt on polynomials and coordinate geometry transformations Ppt on conference call etiquette in the workplace Download ppt on modern farming methods Ppt on latest technology inventions Ppt on sea level rise simulation Ppt on functional components of computer system Ppt on rational numbers Ppt on power system stability classification