Heat Transfer and Equilibrium
(a) The soft drink and the ice have different temperatures, T1 and T2, and are not in thermal equilibrium. (b) When the soft drink and ice are allowed to interact, energy is transferred until they reach the same temperature T, achieving equilibrium. Heat transfer occurs due to the difference in temperatures. In fact, since the soft drink and ice are both in contact with the surrounding air and bench, the equilibrium temperature will be the same for both.
Source
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"OpenStax College, College Physics. October 13, 2012."
http://cnx.org/content/m42223/latest/?collection=col11406/1.7
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