View source for Isobar (pressure)

[[Category:Done 2015-09-06]]
<onlyinclude>An '''isobar''' in the context of [[thermodynamics]] refers to any process in which the [[system]] remains at a constant (unchanging) [[pressure]] throughout it.</onlyinclude>

When a system expands at a constant pressure, such as a [[piston]] in an [[internal combustion engine]], its [[volume]] is increasing and this corresponds to an output of [[work]]. However the system cannot do this work without an input of [[heat]]. By analyzing the [[first law of thermodynamics]], the amount of heat necessary to do a given amount of work without the pressure changing can be calculated by use of the system's [[specific heat capacity]]. 

For more information, visit [http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/cppro.html#c1 Hyperphysics].