Hi all
I hope someone can shed some light on this one. I am currently preparing for my IR paper 1 and will be writing next month (July 24). I have been looking at some past papers and lately they give you amongst other things a oil heater say 500W but they specify volume as well like (10L or 12L). I am not sure what to do with this volume, or do I just ignore it?

Please assist
Mapholoba