The normal freezing point of a liquid is is the temperature at which a liquid becomes a solid at 1 atm. A more specific definition of freezing point is the temperature at which solid and liquid phases coexist in equilibrium. Let's see if we can figure out why the freezing point is lowered when we add solutes to a solution.
Equilibrium solutions in which solutions that start "near" them move away from the equilibrium solution are called unstable equilibrium points or unstable equilibrium solutions. So, for our logistics equation, \(P = 0\) is an unstable equilibrium solution.Note that for a system in thermal equilibrium if ice and water are present the temperature must be 0 0 C. If heat is added, ALL the ice must melt before the temperature will rise above 0 0 C. There is this farmer who is having problems with his chickens.
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