Running totals show what has piled up, while rates show how fast it changes....

https://wordspringer.com/s/zEuM8NmWjdFJPVkLpWohe

Running totals show what has piled up, while rates show how fast it changes. Use parcels and rainfall to see why units and time windows matter: parcels by noon differs from parcels per hour, just as daily inches differs from inches per hour