Chadwick Boseman Has Help in His Corner. A good trainer is worth his/her weight in gold simply from the knowledge they have about training, recovery, and lifestyle philosophy. While we donât get to see many clips of Bosemanâs work in the weight room, we get a few of him with his martial arts instructor Marrese Crump.
In chemistry, a closed system is where no reactants or products can escape, only heat can be exchanged freely (ex. Ice cooler). A closed system can be used when conducting chemical experiments where temperature is not a factor (i.e. reaching thermal equilibrium)
  It means that the case is closed-- either the case was dismissed, the Defendant acquitted, or the Defendant was convicted and sentenced for the crime. 1 person found this useful.Edit.nswer by Icy463. Confidence votes 101. A closed case means that the case has been resolved. A person was found innocent or guilty of a crime, sentenced and sent to jail, or set free. The case has followed the legal process and has been completed.