To share with the entire class:

• LEGO MINDSTORMS NXT Education Base Set (such as part #2095 for $159.98, available at https://shop.education.lego.com/legoed/education/NXT/NXT+Base+Set/5003402&isSimpleSearch=false; this set includes the 3 motors, wires and LEGO NXT brick needed for this activity)
• LEGO NXT temperature sensor ($27.96, available at https://shop.education.lego.com/legoed/education/NXT/NXT+Temperature+Sensor/9749&isSimpleSearch=false)
• ice cubes, 3 lbs (1.4 kg)
• metal pot
• hot plate or stove
• laptop computer on which to record/display data
• any cables required to connect NXT brick to computer
• States of Matter Pre-Assessment, one per student
• States of Matter Data Sheet, one per student
• States of Matter Post-Assessment, one per student