Materials

a large glass or clear plastic
tank/container such as this (rectangular
shaped preferred)

washable paint or food coloring (2 different
colors. I used blue for cold and red for
warm.)

2 cups

water

refrigerator

adult supervision/help to boil and handle
hot water
Procedures
In this experiment, we need cold water with one coloring
added to it and warm water with another so that we can see
and distinguish the two. You will use blue for cold and red for
hot. A couple of drops goes a long way!!!
1. To get cold water, you can first add the blue
coloring into tap water and then chill it in the
refrigerator. Or you can make ice cubes by putting it
into the freezer.
2. For the warm water, use the hot pot to heat the
water. After adding the red coloring i nto the warm
water, you can either use a cup to hold it, or put it
into a narrow-necked bottle.
3. Fill the large tank with room temperature water.
4. Slowly pour the cold water (or ice cubes) into one
end of the tank.
5. Then pour the warm water into the other end.
6. Observe how the blue quickly descends into the
bottom of the tank while the red floats on top and
the water churns.
7. Draw and label a diagram on your lab sheet to
show what happens.