Low budget...high comprehension! In this 3 page hands-on exploration, students will monitor and record the temperture of the phase changes from solid to liquid to gas. After collecting the data, the students are then asked to graph a phase change curve, which demonstrates the heat of fusion and heat of vaporization as flat lines. This is an excellent resource to accompany lessons in the principles of thermodynamics, phase change, or potential and kinetic energy. Also, the activity could be expanded with specific heat word problems, or the use of a substance other than liquid water. For example, duplicate the lab with a saturated salt solution and compare the values of heat of fusion/vaporization. Many concepts could be explored with low budget means!