According to google...
torr = "a unit of pressure used in measuring partial vacuums, equal to 133.32 pascals"
bar = "a unit of pressure equivalent to 100,000 newtons per square meter or approximately one atmosphere"
atm = "a unit of pressure defined as 101,325 Pa"
pascal = "the SI derived unit of pressure used to quantify internal pressure"; "one newton per square metre (kg * m^-1 * s^-2)"
This site gives a pretty good idea of what pressures to use for various conditions like STP, SATP, etc.:https://www.engineeringtoolbox.com/stp- ... d_772.html
If the pressure is not defined, you can use a modified version of the ideal gas law (P = (n/V)RT, where n/v = concentration) to find it if you are given the other units.