Will physic object in a perfect environment last/exist forever? We know,i.e. wood/steel tables in earth will completely broken or disappear in a very future day.
If we put the table in a perfect/ideal environment (maybe in vacuum), will the disappear/broken still happen again?
"Ideal" means every outside factors, temperature, pressure and gravity etc, is just perfect for the table and the table can endure. Table wouldn't move, only the particles of the table move.
I always think that the movement of the particles eventually makes the table or other physics object die/decay. Every objects decay for the internal cause. I don't know if this is true, so I ask this question.
 A: The entropy of a closed system only increases, so if the system is in the state of maximum entropy, it will stay in that state, otherwise it will evolve toward higher entropy.  
A wood table is probably not maximum entropy, although it would take some work to define exactly what this means.  Wood smithereens spread throughout the entire available volume should have higher entropy.  Chemical changes would result in higher entropy as well.  Eventually, a wood table in a vacuum should evaporate/dissolve/decay.  Doing things like removing all the oxygen from the environment will slow the process down, but the increase of entropy is inevitable.
This is a statistically true.  There is a very low probability of entropy decreasing briefly.  For example, see the Poincare recurrence theorem.  This also ignores cosmological considerations, which seem irrelevant to the question and which I also don't know about.
A: Although the question has some vagueness in its conditions there are some further points which might be of interest. In addition to the Thermodynamic property of Entropy mentioned in the other answer we also have the property of Temperature and its Thermodynamics to consider.
The object will (a) approximate a Black Body and will emit thermal radiation reducing its energy over time; and relatedly (b) equalize to the Temperature of its environment.
If we take the environment to be somewhere of the same Temperature as the object initially, then that environment will require an infinite amount of energy over time just to remain at that Temperature. So this is arguably unrealistic. The second law of Thermodynamics will also begin to apply in this environment as some atoms are evaporated from the surface of the table, increasing the entropy and destroying the table.
If we take the environment to be deep space then (at 3K) the table will equalize to that Temperature. This will affect the steel/wood structure of the table: it will become more brittle over time. Any external energy (ultimately even from photons) will tend to fissure then fracture the table.
An interesting application of this question is to the formation of the materials surface of space-craft (like Pioneer) which need to stay in space indefinitely. Similar effects will happen here. Generally such spacecraft have an internal power source to keep going, but I dont know how much longer they will survive.
