Not really. The density of merc canges with tmp. Raise the tmp value and the merc will expand. Adding heat raises the tmp value. FYI: the life value of merc determines if it is sprked or not
MERC was added for a few reasons. First off, it has 2 life values. Secondly, it has a few differences from DEUT first off, it conducts, secondly, it expands differently from DEUT. I am going to talk to a few people and see if I can get a petition going to include a few more properties to MERC including vaporization and solidification. I already have it coded in my mod if you want to see how it would work.