Quantity
Quantity[magnitude, unit] represents a physical quantity with a numerical value and unit. Quantities support automatic unit handling in calculations.
Examples
Create and work with quantities:
Quantity[5, "Meters"]
(* Arithmetic with units *)
Quantity[100, "Kilometers"] / Quantity[2, "Hours"]
(* Quantity[50, "Kilometers"/"Hours"] *)
(* Mixed units work automatically *)
Quantity[1, "Meters"] + Quantity[50, "Centimeters"]Please visit the official Wolfram Language Reference for more details.