1. Units
1.1. Allowed units
The following units are allowed: N, kN, tonne, m, ft, kg, Mg, lbs, s, h, C, deg, rad, Pa, year
1.2. Algebra on units
It is possible to perform simple algebra on the units according to the following rules:

Multiplication is denoted by *. A unit can contain any number of multiplication operations.

Division is denoted by /. Only one division is allowed per unit. Note: any combination of symbols before and after a division operator is interpreted as if they were inside parentheses.

A unit can be raised to the power N by invoking the operator ^.
Examples:

kN/m^2 is equivalent to kN/m*m is equivalent to kN/(m*m)

N*m/s^2 is interpreted as (N*m)/(s^2)

1/1/s is not allowed.