Because of the change in work capacity of the system under External pressure (Pext), so that it is used as a - Pext to make the contraction caused by a positive and work as a result of the expansion is deleted (in the physics w = Pext VW = - Pext V V
when the volume changes (Vf - Vi)
Vf Vi and capacity of the system is the final state (final volume), and state start-up (initial volume), in the order
gas expansion and contraction.When you blow the balloon, just one-half full, and then put it in the sunlight, the balloon will be a large, obviously. And if you have another child, the wind blowing balloon will be full as much as the full and take it away, and then put it to sunlight again.Why don't why balloon to large-scale, and sometimes to the breaking when it is hot, it is because there is a balloon in the air, there is molecular gas to drift in all directions.It will push your skin within balloon balloon so much tension when the sunlight, molecular heat up so that they will be fast moving and pops up to affect the skin on the inside of the balloon and more frequently.The hot molecules to molecules cool, it looks like more space, with a fury to fly within the very tempted I was, the more heat much faster, more flights, balloon expansion only and more.When high temperature gas, it must be used more space, i.e. the more it will be "expanded" (Expansion)
On the contrary, if you take the balloon placed in the evening it will be back in a small balloon will be down significantly because the more molecules of air cooled down much the same as it would be much more mobile and will only slow down balloon pressure within less.Cold molecules using molecular area less than the more heat to the cool air, it will slow down even more and use less space, only one other is when gas is cooled down, it will be "Contracted" (Contraction)
high-temperature solid when it will be up to a level and has become a liquid melt and, if high-temperature liquid, it will be volatile change to gas instead, but what made it more difficult to get noticed is to change the status of a previousIt will start to grow up a little bit as soon as this is because when molecular mobility, the more it moves faster, more away from each other. which occurs both the molecules of solids and liquids, therebyto allow for the expansion in the case where the liquid in the bottle is too high temperatures. Actually, we should not add some liquid, full bottles because if liquids in bottles too high temperature when there is the chance to explode
Rule 2 of the dynamic macromolecules: Light Industry (2 nd Law of Thermodynamics)
Rule 1 describes the energy of the system changes when he was in the process of rule 2, to explain about the variables in the direction of the process, whether it is a physical or a chemical (driving forcephysical and chemical change), a critical factor about the direction of the lean process occurs, is calling this year (entropy,S) in this part of the lesson, it will be said of this variable and how to calculate the relevant
Many processes in nature can occur by itself is not required to do anything for the system while it is not certain the process can occur. The process can occur, can be called natural or spontaneous change changethe expansion of the gas volume at least to more capacity,The cool down of the objects to the hot temperature of the environment and some of the reaction occurs in the same direction can occur. We can do that with a gas volume decreased,reactions to occur in the opposite direction, but it will be done for the work to have to rely on the help that is not the process that occurs in nature
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