If you want a high-tech, presbyopia-correcting intraocular lens for your cataract procedure, then costs would increase to an average of about $4,591 per eye (vs. $4,461 in 2010, $4,337 in 2011, $4,269 in 2012 and $4,350 in 2013).
When Î´S is negative and Î´H is negative, the relative magnitudes of Î´S and Î´H determine if the reaction is spontaneous. Low temperatures make the reaction more favorable. When Î´S is negative and Î´H is positive, a process is not spontaneous at any temperature, but the reverse process is spontaneous.A spontaneous process is the time-evolution of a system in which it releases free energy (usually as heat) and moves to a lower, more thermodynamically stable energy state. spontaneous process is capable of proceeding in a given direction, as written or described, without needing to be driven by an outside source of energy.
1 At the higher temperature, the reaction is not feasible as the entropy of the reaction is decreasing. 2  However, ice will melt at this temperature, as the entropy increases 3  : Both the processes of ice melting at 10 o C and water freezing at -10 o C are spontaneous reactions; they can occur. The total entropy is equal to: 2  Using this equation for the freezing of water at -10 o C for example: 3  The overall entropy increases, and so the reaction is feasible (in thermodynamic terms, the reaction would be described as being spontaneous; however, this does not in any way describe how fast the reaction occurs).