Heat and Density Review
Complete the following handout to review the connections between heat and density. If you need help filling out your
answers, you may use the textbook. This concept is covered on page B 52.
Word Bank
Heat source
Speed up
Density
Away from
Less dense
Convection
Push through
Cool down
Closer
Faster
___________________________ refers to how tightly packed together the molecules are in an object. When they are
mixed together, more dense objects will always _____________________ less dense objects.
When objects are heated, they become ____________________. This is because when molecules are moving
_________________, they need more space between them. As objects _______________________, their molecules
move slower. This means that they take up less space and are denser.
__________________________ is the movement of heat through liquids and gasses. The molecules that are closest to
the heat source _________________________ and become less dense. The molecules that are farthest from the heat
source slow down and become denser. The cooler, denser molecules found furthest from the heat source will push
through the less dense molecules, moving ________________ to the heat source. There, they will speed up, expand and
become less dense. The less dense molecules found closest to the heat source will be pushed _____________________
the heat source. There, they will slow down, contract and become more dense.
This cycle will continue until the _____________________ is taken away.