![]() ![]() Then, when every mailbox has one, she starts putting a second one into each box, and so on. When a whole pile of energy packages arrive, the postmaster does her best to put one package into every mailbox. ![]() It turns out that, in the molecular world, there is such a system, and it follows a pretty simple rule. There needs to be some system of deciding where to put all of these packages. Still, there are an awful lot of mailboxes that most of the energy packages could still fit into. The energy packages need to go into mailboxes that they will fit into. Some of the packages don't fit into some of the mailboxes, because some of the packages are too big and some of the mailboxes are smaller than the others. The packages come in different sizes, because they contain different amounts of energy, but other than that there is no identifying information on them. The energy packages don't arrive in your molecular dormitory with addresses on them. But how does the mail get to your mailbox in the first place? Later on, you might take the energy packages out of your own mailbox and use them to take a trip to the mall or the gym. Instead of putting mail in these boxes, we're going to use them to hold little packages of energy. The mailboxes are of several different sizes: maybe there are a few rows of small ones, a couple of rows of medium sized ones, and a row of big mailboxes on the bottom. ![]() You may have a wall of them in your dormitory or your apartment building. How this energy is divided up is the concern of entropy.īy way of analogy, picture a set of mailboxes. We sometimes speak of the energy in a system as being "partitioned" or divided into various "states". Entropy has something to do with how that energy is stored. Enthalpy has something to do with the energetic content of a system or a molecule. \)Įntropy is another important aspect of thermodynamics. ![]()
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