Create gluep, a substance that can act as a solid and a liquid. Mix 1 tsp. of borax with 6 tbsp. of water. In another bowl, mix 1 tbsp. of white craft glue with 1 tbsp. of water. Combine the two mixes and kneed until you have gluep. Invite kindergarten children to use their observation skills as they roll the gluep into a ball or cylinder. Ask them to observe if the gluep stays in place or moves and ask them to use describing words to tell about the consistency of the gluep.
Make a yummy ice pop experiment to show children how a liquid can become a solid and can turn back into a liquid. Fill an ice cube tray with fruit juice. Let children choose their favorite fruit juice, but ask parents about allergies before the experiment. Put a clean craft stick into each section of the fruit tray. Freeze the ice pops and serve them to the children. Note how the liquid froze into a solid. As the kindergartners eat the ice pop, make note that the solid is turning back into a liquid form.
Provide kindergarten students with mittens or gloves and a mound of shaved ice. Let children experiment with the shaved ice. Ask them to work in groups to create snowmen. Ask children to describe the temperature and consistency of the ice and let them observe the melting of the "snow." Take pictures of the snowmen and display on a bulletin board. Let the snowmen melt and take another picture of the water to post on the bulletin board.
Show kindergarten children a package of powdered gelatin mix. Let children watch as the teacher prepares the gelatin per the package instructions. Adding boiling water to the powder mix will turn the powder into a liquid. As the gelatin cools, it will solidify again into a wiggly, jiggly solid.
Take children outside on a cold and snowy day. Have them observe an icicle. Check the icicle throughout the day to see how it changes. Ask children to describe the changes in the icicle.