Thermal physics notes - PHYA5

 Summarised notes of chapter 11.

HideShow resource information
  • Created by: glow.
  • Created on: 02-03-13 11:09
Preview of Thermal physics notes - PHYA5

First 159 words of the document:

Thermal physics
Energy transfer happens when:
One object does work on the other one
Energy transfer due to a temperature difference
Internal energy of object changes as result of:
Heat/energy transfer by radiation
Work done by force or electricity on/ by object
If internal energy constant, either:
No heat/ energy transfer by radiation and no work done
Heat/ energy transfer by radiation and work done BALANCE each other out
Heat: solids ­ molecules vibrate
about fixed positions due to
forces. May break with enough KE
supplied which raises PE of
Liquids ­ forces not strong enough
to hold molecules in fixed
positions. More energy supplied
to raise temp = increase KE
molecules = vaporisation
Gas ­ almost no forces of
attraction between moleucles ­
high speeds ­ collisions with
container responsible for pressure
which gas exerts on container.

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Fixed points: standard
degrees of hotness which
can be accurately
Celsius scale
ICE POINT ­ 0' ­ pure melting ice
STEAM POINT ­ 100' ­ steam at standard atmospheric pressure
Absolute scale
ABSOLUTE ZERO ­ 0K ­lowest possible temp.
TRIPLE POINT OF WATER ­ 273.16K - temp which ice water and water vapour are in thermal
An object at absolute zero has minimum internal energy.…read more

Page 3

Preview of page 3

Here's a taster:

The temperature rise of an object when it's heated depends on:
Amount of energy supplied to it
Substance(s) from which object made
Q = M C T
Inversion tube experiment
GPE internal energy when it hits bottom. Little spheres in tube carry
energy.…read more

Page 4

Preview of page 4

Here's a taster:

Electrical energy supplied: IVt
M C T = I V T
known mass in insulated calorimeter.…read more

Page 5

Preview of page 5

Here's a taster:

The three physical states of a substance have different physical properties:
Density of gas much less than liquid or solid because liquid/solid molecules compact and in
contact with each other. Molecules of gas separated by large distances.
Solids cant flow because there atoms are locked together by strong force bonds which
atoms unable to break from. Liquids/ gases have too much KE and bonds can't keep
molecules in fixed positions.…read more

Page 6

Preview of page 6

Here's a taster:

Q = ml
Where l is latent hear of fusion/ vaporisation ( Jkg^-1)…read more


No comments have yet been made

Similar Physics resources:

See all Physics resources »See all resources »