Physics 202 Lecture 4 Heat and Temperature.

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Presentation transcript:

Physics 202 Lecture 4 Heat and Temperature

Of the many possible temperature scales, the Celsius and Kelvin scales are preferred http://en.wikipedia.org/wiki/Heat_Miser http://en.wikipedia.org/wiki/Snow_Miser http://www.freefoto.com/preview/16-11-1/Outdoor-Thermometer 2

Thermometric properties are linear in small increments; simplest is thermal expansion http://www.schenectady.k12.ny.us/users/pattersont/IBDT%20Website/Page_Generators/ThermalExpansion.html http://alliance.la.asu.edu/slides/stop02/2b/2b.html

The difference between temperature and heat: heat capacity and internal energy Fire Water Air Earth Hot Cold Wet Dry

Phase changes also show the distinction between heat energy and temperature http://upload.wikimedia.org/wikipedia/commons/thumb/3/34/Phase-diag2.svg/530px-Phase-diag2.svg.png

Heat energy is transported via conduction (solids) and convection (fluids) http://www.insulationcavity.com/tag/heat-insulation-2 http://whatscookingamerica.net/boilpoint.htm

The electromagnetic field is also able to transport heat energy via radiation http://news.bbc.co.uk/media/images/45778000/jpg/_45778122_15_5_steel.jpg http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/what_is_ir.html

Very high temperatures can rip apart the atoms in a gas to create plasma http://en.wikipedia.org/wiki/Sun http://en.wikipedia.org/wiki/Physical_vapor_deposition http://en.wikipedia.org/wiki/Plasma_(physics)

Very low temperatures reveal a new world of superconductivity and other effects http://en.wikipedia.org/wiki/Superconductivity http://hyperphysics.phy-astr.gsu.edu/hbase/solids/scdis.html http://www.abc.net.au/science/articles/2011/07/20/3273635.htm BCS

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