Macrostate
The macroscopic state of a thermodynamic system defined by observable thermodynamic variables like pressure, volume, temperature, and total energy.
Governing formula
Defined by (P, V, T, N, U)
SI unit
N/A
In depth
A single macrostate corresponds to a vast number $Ω$ of distinct underlying microscopic particle configurations (microstates).
Examples in the real world
Describing 1 liter of helium gas at 1 atm and 300 K as a single macrostate.