In bomb calorimeter, when dry ice is added to warm water, the final mass of the inner cup and remaining water is less than the initial mass of the inner cup and water. The calorimeter did not decrease in mass so it means water is lost but not gone it just changes it state. The water was in liquid form first but then it turns to gas i.e water vapor which most likely left the system and is not reflected in the final weight. This is the loss in mass. Why did the system lose water mass? I think this is because part of the heat from the water reached it's latent heat of vaporization, but I'm not sure. Please advise.