demonstration helps to show that our bodies lose water while doing everyday
activities and how it is important to drink water to stay hydrated.
Take a 4” x 6” sponge and draw a man on it, like the outline
of a gingerbread man.Cut the sponge-man
out using scissors.Sit the sponge out
for four days before using it in the lesson, so that it is dried out and stiff
to begin the lesson.
Note:This demonstration can conclude after several
hours or several days, depending on how long it takes the sponge to completely
dry out. Therefore, it is important that enough water is added to the sponge so
that information can be collected at two time periods.Students should observe Sponge-Bobby in the
wet stage and in the dry stage.
students around a table with a sponge, cup of water and plate.
them to Sponge-Bobby and explain that Sponge-Bobby is like us, because he
is healthiest and feels his best when his body is full of water.
the dry sponge around the class and discuss the texture of
Sponge-Bobby.Emphasize that in this
state, Sponge-Bobby is dehydrated and doesn’t have any water.
water to Sponge-Bobby until he is full of water.
students write a hypothesis (guess) about what will happen to
Sponge-Bobby.Have students keep
observations in their journals.