The shannon also serves as a unit of the information entropy of an event, which is defined as the expected value of the information content of the event (i.e., the probability-weighted average of all potential events). Given a number of possible outcomes, unlike information content, the entropy has an upper bound, which occurs when the possible outcomes are equiprobable. The maximum entropy of n bits is n Sh. A further quantity that it is used for is channel capacity (usually per unit time), which is the maximum of the expected value of the information content that can be transferred with negligible probability of error encoded over a channel.
