STATES OF MATTER CHAPTER 2 TEST REVIEW Tools A B buoyant force net upward force caused by displaced fluid melting point temperature where substance changes from a solid to a liquid solid definite shape and volume surface tension enables you to float something on water matter anything that has mass and takes up space gas can completely fill a container (can be expanded) boiling point temperature where liquid begins to turn to gas specific heat objects don't heat at the same rate liquid particles held as group, but not in a fixed position float what an object will do if its density is less than that of the fluid its in heat movement from a higher temperature to a lower temperature temperature average energy water example of a high specific heat