} Therein Lies the Rub.

&--Monday, April 16, 2007 ; 8:16 PM
EldwinSchrodinger @ Quantum Theory - Thermodynamics

loving you always ♥

to understand paradoxes in the universe, we would first need some background in thermodynamics and of course statistics which are important to the development of quantum theory.

first of all, when i first started on quantum theory, i would ask myself. what the heck is thermodynamics and entropy? its actually not as tough as you would think :) it actually means the movement of heat from a body with higher temperature
to a body with lower temperature. till the temperatures of the two bodies are the same. and thats called thermal equilibrium.

here's a simple example. this particular girl leaves her seat after sitting for about 10 minutes, and you sit on that same sit. you'll find that the seat is warm. now why? its because the molecules in the seat are still vibrating at the same rate as in that girl's body. which is apparently faster than that yours. hence, the seat feels warm to you. and when it doesn't feel warm, it reaches thermal equilibrium! =)

here' the first law of thermodynamics - law of the conservation of energy. " the quantity of heat can be equated to a certain amount of mechanical work ". thus. heat can be converted into work and must be a form of energy. and when a certain amount of energy disappears somewhere, an equal amount must appear elsewhere in the same system.

for the 2nd law of thermodynamics, it is said that when time is elapsed, all energy would eventually be transformed into heat at a uniform temperature and all natural process would stop. this is also based on the principle of the dissipation of energy or just entropy. "the total entropy of a system always increases whenever heat flows from a hot body to a cold body" AND, it also increases whenever mechanical energy is changed into thermal energy in certain collision and frictional processes.

according to physicist ludwig boltzmann, entropy dependson the probabilities of molecular arrangements. for eg, if a state has a very large number of different ways its molecules could be arranged, then it has a very large entropy. thats why, if an egg were to fall on the floor and breaks, it is very unlikely to reform into its original shape.

if the entropy of an isolated system increase, what does that mean? it actually means that heat does not flow on its own from the cold body to the hot body. like a ball cannot bounce higher than its original position by converting heat to mechanical energy. likewise an egg cannot unscramble itself. if that happens, that would not violate the newtonian mechanics. but to instead, decrease the entropy of a system and thus forbidden by this 2nd law of thermodynamics. and this law tells time which way to go! =D

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