Chapter_19 - Ch 19 Heat and First Law of Thermodynamics Focus Heat and Work 1 Heat Q is a form of energy in calories 1 cal = 4.186 J 1 3 3 2 2

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Ch 19: Heat and First Law of Thermodynamics 1) Heat Q is a form of energy– in calories: J 186 . 4 cal 1 = Focus: Heat and Work 2) Internal energy U : ( ) RT n T Nk m N U B 2 3 2 3 2 2 1 v = = = 4) Calorimetry: 3) Specific heat c : T mc = Q Heat input to raise temperature by D T=T f -T i m = mass in kg c in kcal/kg/ o C * Note Q < 0 means heat output . Heat gain = Heat loss Q cold = - Q hot T f >T i cold T f < T i hot Gains heat Loses heat (monatomic gas)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Ch 19: Heat and First Law of Thermodynamics 5) Latent heat L: the heat needed to change phase : L m = Q L v heat of vaporization = heat input needed to change liquid to gas L f heat of fusion = heat input needed to change solid to liquid * Note sign change (heat output ) for reverse process – gas to liquid or liquid to solid 6) First Law of Thermodynamics: Energy Conservation D U = Q - W Heat added to system Work done by system U = system property, Q, W not
Background image of page 2
Ch 19: Heat and First Law of Thermodynamics 7) Isothermal processes: T R n 2 3 U = D T = 0 D U = 0 Q = W or W = Q 8) Adiabatic processes: Q = 0 D U = - W 9) Work: ∫∫ = = = B
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 05/13/2010 for the course PHYSICS 53L taught by Professor Mueller during the Fall '07 term at Duke.

Page1 / 5

Chapter_19 - Ch 19 Heat and First Law of Thermodynamics Focus Heat and Work 1 Heat Q is a form of energy in calories 1 cal = 4.186 J 1 3 3 2 2

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online