Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
You place a pot of soup on the stove. As the soup warms you notice some areas where soup
... [Show More] is
rising up and other areas where soup is sinking down.
1. Why do you think some of the soup is rising up?
Because the soup became warm and less dense, so it
rose up.
2. Why do you think some of the soup is sinking down?
Because it is colder and denser than the other parts of
the soup.
Gizmo Warm-up
When fluids (gases or liquids) are heated, they tend to move.
This motion is called convection. In the Convection Cells
Gizmo, you will observe and experiment with convection both
in a laboratory setting and in several real-world examples.
To begin, note the laboratory setup on the MODEL tab. A
beaker of liquid is placed above a gas burner. Click Play ( ).
The burner is now heating the fluid.
1. What do you notice? The liquid inside the beaker is moving in a circular motion
2. Drag the eyedropper into the beaker just above the burner and let go to release a drop of
orange liquid into the beaker. What do you notice about the path of the drop?
The path of the drop is circular, the drop is moving in a circular motion.
Activity A:
Convection
Get the Gizmo ready:
Click Reset ( ), and set Burner A to High.
Question: What causes convection cells to form?
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2019
1. Hypothesize: Click Play, add a drop, and watch the motion of the liquid. Why do you think
convection tends to occur in heated fluids?
Because the heat allows the liquid to rise, while the less heated areas to sink. This pattern
then is able create a convection.
2. Observe: Click Clear drop. Under Show, select Temperature. The temperature scale runs
from red (hot) to dark blue (colder).
A. Where is the hottest liquid located? Right on top of the gas burner/left bottom corner
of the beaker.
B. Where is the coldest liquid located? On the surface of the beaker/any part of the
beaker far away from the gas burner.
C. Add a drop. Does the hottest liquid tend to rise or sink? Rise .
D. Does the coldest liquid tend to rise or sink? Sink . [Show Less]