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'''Thermodynamics''' is the study of the effects of work, heat, and energy on a system. Thermodynamics is only concerned with so-called ''macroscopic'' observations, which are observations on large numbers of particles.<ref>http://www.grc.nasa.gov/WWW/K-12/airplane/thermo.html</ref>

'''Thermodynamics''' is the study of the effects of work, heat, and energy on a system. Thermodynamics is only concerned with so-called ''macroscopic'' observations, which are observations on large numbers of particles.<ref>http://www.grc.nasa.gov/WWW/K-12/airplane/thermo.html</ref> Measurements in thermodynamics are usually reported on the [[International System of Units#Kelvin|Kelvin scale]] <ref>David Halliday, "Fundamentals of Physics Extended", John Wiley & Sons, New York, 1997 </ref>

==Thermodynamics and statistical mechanics==

==Thermodynamics and statistical mechanics==