1. The problem statement, all variables and given/known data The volume in a constant-pressure gas thermometer is directly proportional to the absolute temperature. A constant-pressure thermometer is calibrated by adjusting its volume to 1000 mL while it is in contact with a reference cell at the triple point of water. The volume increases to 1628 ml when the thermometer is placed in contact with a sample. What is the sample's temperature? 2. Relevant equations pV=nRT 3. The attempt at a solution To be honest I do not know what i am doing here. I tried using pV=nRT to find the temperature using the two volumes that were given by setting up two equations. One with v1 and the other with v2 then setting them equal to eachother and solving for the temperature. I get lost however so any help would be appreciated.