Help them tape bags to the inside of the window. Leave bags in the sun for most of the day. Near the end of the day, have the kids observe the bags. This activity works best when there is a big difference between day and night temperatures. Let students examine the water mixture.
Students hold strainers over bowls.
Help them pour the water through strainers twice. As they work, have students observe the water. Help groups strain water through three coffee filters, using one filter at a time. Have students observe water again. Read our Privacy Policy Statement .