Difference between revisions of "Heat capacity"

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<div class="definition"><div class="short_definition">(<br/>''Also called'' thermal capacity.) The ratio of the [[energy]] or [[enthalpy]] absorbed (or  released) by a system to the corresponding [[temperature]] rise (or fall).</div><br/> <div class="paragraph">Heat capacities are defined for particular processes. For a constant volume process,  <div class="display-formula"><blockquote>[[File:ams2001glos-He3.gif|link=|center|ams2001glos-He3]]</blockquote></div> where ''U'' is the [[internal energy]] of a system and ''T'' is its temperature. For a constant [[pressure]]  process,  <div class="display-formula"><blockquote>[[File:ams2001glos-He4.gif|link=|center|ams2001glos-He4]]</blockquote></div> where ''H'' is the system enthalpy. The heating rate, ''Q'', for a constant volume process is  <div class="display-formula"><blockquote>[[File:ams2001glos-He5.gif|link=|center|ams2001glos-He5]]</blockquote></div> whereas in a constant pressure process,  <div class="display-formula"><blockquote>[[File:ams2001glos-He6.gif|link=|center|ams2001glos-He6]]</blockquote></div><br/>''See'' [[specific heat capacity]].</div><br/> </div>
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<div class="definition"><div class="short_definition">(''Also called'' thermal capacity.) The ratio of the [[energy]] or [[enthalpy]] absorbed (or  released) by a system to the corresponding [[temperature]] rise (or fall).</div><br/> <div class="paragraph">Heat capacities are defined for particular processes. For a constant volume process,  <div class="display-formula"><blockquote>[[File:ams2001glos-He3.gif|link=|center|ams2001glos-He3]]</blockquote></div> where ''U'' is the [[internal energy]] of a system and ''T'' is its temperature. For a constant [[pressure]]  process,  <div class="display-formula"><blockquote>[[File:ams2001glos-He4.gif|link=|center|ams2001glos-He4]]</blockquote></div> where ''H'' is the system enthalpy. The heating rate, ''Q'', for a constant volume process is  <div class="display-formula"><blockquote>[[File:ams2001glos-He5.gif|link=|center|ams2001glos-He5]]</blockquote></div> whereas in a constant pressure process,  <div class="display-formula"><blockquote>[[File:ams2001glos-He6.gif|link=|center|ams2001glos-He6]]</blockquote></div><br/>''See'' [[specific heat capacity]].</div><br/> </div>
 
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Latest revision as of 15:23, 20 February 2012



heat capacity

(Also called thermal capacity.) The ratio of the energy or enthalpy absorbed (or released) by a system to the corresponding temperature rise (or fall).

Heat capacities are defined for particular processes. For a constant volume process,
ams2001glos-He3
where U is the internal energy of a system and T is its temperature. For a constant pressure process,
ams2001glos-He4
where H is the system enthalpy. The heating rate, Q, for a constant volume process is
ams2001glos-He5
whereas in a constant pressure process,
ams2001glos-He6

See specific heat capacity.