1. The problem statement, all variables and given/known data A metal ball with pressure gauge at room temperature and standard pressure is immersed into three different liquids each with different temperatures in succession (the three liquids are alcohol in dry ice, boiling water, and freezing water), and then is immersed into these liquids in different orders for each respective sequence. At the end of each sequence, the device is immersed into the alcohol and dry ice and the valve on the pressure gauge is opened until the pressure reads that of standard pressure, and then the valve is closed again before continuing on to the next sequence. What is the purpose of opening the valve in the alcohol with dry ice then closing it before immersing it into the other liquids? 2. Relevant equations N/A 3. The attempt at a solution I would think that you have to leave the device alone until it reaches standard temperature by itself before moving on to the next sequence. I don't understand why you have to do this at all. Doesn't make any sense to me.