This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: FNT #14: Heat, work and thermodynamics Damien Martin December 2, 2006 Question 1 Complete an activity, no solution as such. Question 2 Question 3 Here are three conditions: (I) Q = 0 (II) Δ U = 0 (III) W = 0 Consider the following processes applied to a fixed amount of ideal gas. Which of the following must hold for these types of processes. a) An isochronic (constant volume) process As W . = P V . any process at constant volume must mean V . = 0. Therefore W = 0, and so (I) is true. We know that we can heat a gas at constant volume, and this would be an example of Δ U = Q 6 = 0. Therefore the fact that the process occurs at constant V does not imply (II) or (III). b) An isobaric (constant pressure) process Here we have W = P Δ V . There is no requirement that Δ V = 0, so W 6 = 0 (generally). 1 Looking now at our ideal gas law: PV = nRT ⇒ P Δ V = nR Δ T (constant P ) If V increases (Δ V > 0) then T must also increase. This tells us that Δ U > as Δ U = Δ E thermal for an ideal gas. Therefore we can have processes withfor an ideal gas....
View
Full
Document
This note was uploaded on 10/22/2010 for the course PHY 7A 56192 taught by Professor ? during the Summer '09 term at UC Davis.
 Summer '09
 ?

Click to edit the document details