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P-V Diagrams and processes C ontents: Basic Concept Example Whiteboards. Isobaric Expansion (+ W). Isobaric Compression (- W). Volume. Pressure. P-V diagrams. Iso = same baric = pressure. The axes Change volume? Change pressure?. TOC. Volume. Isochoric = same volume

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Presentation Transcript
slide1

P-V Diagrams and processes

    • Contents:
      • Basic Concept
      • Example
      • Whiteboards
slide2

Isobaric Expansion (+W)

Isobaric Compression (-W)

Volume

Pressure

P-V diagrams

Iso = same

baric = pressure

The axes

Change volume?

Change pressure?

TOC

slide3

Volume

Isochoric = same volume

(closed container)

how does it happen?

Pressure

P-V diagrams

TOC

slide4

Volume

Pressure

Adiabatic (no heat flow) processes

Adiabatic expansion: (Q = 0)

Work is done by the gas (+W)

No heat flows in: Q = U + W

0 = U + W, U = -W

Internal energy (T) drops

Examples

Air rockets

Cold side of fridge

Universe

Demo - cloud

TOC

slide5

Volume

Pressure

Adiabatic (no heat flow) processes

Adiabatic compression: (Q = 0)

Work is done on the gas (-W)

No heat flows in: Q = U + W

0 = U + W, U = -(-W)

Internal energy (T) rises

Examples

Bike pump/diesels

Hot side of fridge

Compressors

Demo – plunger/Murray Frig

TOC

slide6

Volume

Pressure

Isothermal (constant temperature) processes

Isothermal expansion: (T = 0)

Work is done by the gas (+W)

Internal energy is constant (U = 0)

Q = U + W = W

Heat turns to work (slowly)

TOC

slide7

Volume

Pressure

Isothermal (constant temperature) processes

Isothermal compression: (T = 0)

Work is done on the gas (-W)

Internal energy is constant (U = 0)

Q = U + W = W

Work turns to heat (slowly)

TOC

slide8

Volume

Pressure

What’s goin’ on here?

isobaric expansion

heat flows in, temp increases

TOC

slide9

Volume

Pressure

What’s goin’ on here?

isochoric cooling

heat flows out, pressure drops

TOC

slide10

Volume

Pressure

What’s goin’ on here?

isochoric heating, isobaric expansion

TOC

slide11

Volume

Pressure

Which process is adiabatic, which is isothermal?

A

B

In which process would the temperature drop?

B is adiabatic

TOC

slide12

Volume

Pressure

Which process is adiabatic, which is isothermal?

B

A

In which process would the temperature increase?

B is adiabatic

TOC

slide13

Volume

Pressure

A complete cycle:

C

B

A

D

Complete cycle - where is work done?

Is more work done by gas or on the gas?

TOC