Additional non SI units for pressure used by chemists are atmospheres which is ATM. Millimeters of mercury which is mmHg and then just Tor. Now these units for pressure have their own pressure value which can be related to one another. Now remember if you see a purple box, that purple box means you have to memorize it because usually it's not given to you in terms of a quiz or exam.
Now the pressure values associated with atmospheres, millimeters, or mercury and Tor are 17 760 and then 760 again. Now the less commonly known ones, Pascal's cable, pascals, bars, and slides aren't in purple boxes, meaning they're not usually expected to be memorized. They'll be given to you in some way within the question or formula sheet. Now their pressure values are 1.01325×105 K. Remember kilo was 103, so this is one O 1.325. Bars here is 1.01325.
And then finally if we look at PSI, PSI is 14.696. Now these numbers relate to one another. We said that they're a way to relate to each to each other. That means that one atmosphere equals 760 mm of mercury, or 1.01325 bars Equals 14.696 size. So these are just ways of them connecting to one another. But again, it's the first three that are going to be the most important. Even though they're noni units, they're the ones most commonly used by chemists.
So now that we know these different types of pressure values, let's continue onward to an example question.