Macrostate

A macrostate describes the overall condition or appearance of a system, based on measurable properties like temperature, pressure, or volume. It represents the large-scale, observable state, which results from many tiny, underlying details—called microstates—that collectively determine it. For example, the macrostate of a gas might be characterized by its temperature and pressure, while its microstates involve the specific positions and speeds of individual molecules. Many microstates can produce the same macrostate, so the macrostate is a broad summary of the system's overall condition.