The fraction "1/100,000" represents a very small part of a whole. It means that if something is divided into 100,000 equal parts, one of those parts is being referred to. This concept is often used in statistics, measurements, and probabilities to express very low quantities or rare events. For example, in the context of probability, a chance of 1 in 100,000 means that if an event were to occur 100,000 times, it is expected to happen only once. This can apply to various fields, such as healthcare when discussing the likelihood of a rare disease or finance when assessing investment risks.