A total tracks what has built up. A rate shows how fast it changes. With...

https://wiki-nest.win/index.php/If_It_Rains_at_6_mm_per_Hour_for_2_Hours,_How_Much_Rain_Is_That%3F

A total tracks what has built up. A rate shows how fast it changes. With parcels and rainfall, this article explains units and time windows, helping you read parcels per hour or inches per day without confusing a current pace with the total so far.