PHY7A Lecture6

PHY7A Lecture6 - Heat Capacity Definition of heat capacity:...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Heat Capacity Definition of heat capacity: C = Q/ ! T (really C = " Q/dT; i.e. add a very small amount of heat, dQ, and divide by the very small T change that you measure) 1 st Law of Thermodynamics: ! U = Q + W Remember that the internal energy U = E bond + E th If W = 0 AND ! E bond = 0 then ! U = ! E th = Q = C ! T (as you already know)
Background image of page 1

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

View Full DocumentRight Arrow Icon
Specific Heat Capacity (or just specific heat) Specific heat (use a small c instead of a capital C); divide C by a quantity that measures the size of the material so: Mass specific heat = c mass = C/(mass of material) This is the heat capacity of 1kg of the material (i.e. the increase of E th of 1kg of the material when you change T by 1K) Molar specific heat = c molar = C/(# moles in the material) This is the heat capacity of 1mole of the material (i.e. the increase of E th of 1 mole of the material when you change T by 1K) Specific heat per atom = c atom = C/[(# moles)N A ] This is the heat capacity of 1 atom of the material (i.e. the increase of E th of 1 atom of the material when you change T by 1K)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

PHY7A Lecture6 - Heat Capacity Definition of heat capacity:...

This preview shows document pages 1 - 3. Sign up to view the full document.

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