Thermometer stem correction with pressure

[AlexLM]

Hi everyone,

So I'm a bit stuck in my physics lab report. I have to make a correction to the temperature read in the laboratory (ex:155.2C) because our room pressure was 742.1mmHg and not 760mmHg I'm guessing. I've tried researching this for a while now but I can't seem to find an easy answer or remember what to do. They didn't explain it in the lab and told us to refer to the book, ends up there was a mistake in the printing and we're missing a bunch of chapters including the one explaining this concept.

Any help would be greatly appreciated!
Cheers!

 

[Spinnor]

More information would not hurt. Maybe a description of the thermometer or picture. Maybe a scan of the lab procedure.