Rub your hands together. What happened?
You just used energy to make heat!
Energy is the ability to change something or
do work.
Whenever the location, makeup, or look of
something changes, energy is used!
The colors in these thermo grams, or heat picture,
show the different amounts of heat energy.
A thermometer is based on the idea that matter
expands when its particles move faster and contracts
when they slow down.
If it touches matter with particles that are speeding up,
particles in the liquid inside the thermometer
speed up too. They move farther apart.
Because the liquid expands
more than the glass tube, it
moves up the tube. The
reading on the number line
shows a greater number of
degrees. (It’s hotter)
If the particles slow down, the
liquid contracts.
The shorter column in the tube
shows fewer degrees.
The thermometer must be on
or in whatever it’s measuring.
Think of a large pot and a small pot that are each
half filled with boiling water.
Because the
large pot holds
more water, it has
many more water
particles than the
small pot has.
More particles
mean more energy
of motion.
The large pot has
more thermal
energy.
Heat is the
transfer of
thermal energy.
Heat can be
moved in
several ways.
Remember when you
rubbed your hands together
earlier? You used
mechanical energy to make
heat.
When solids are
touching, heat energy
moves by conduction.
Conduction is the
transfer of heat energy by
one thing touching
another.
Some materials let
heat move through them
more easily than others
do.
A material that
readily allows heat to
move is a conductor.
Many metals, such
as aluminum, copper,
and iron, conduct heat
well.
OWWW It’s
Hot! It’s
Hot!
Get back here!
I’m glad this has a
wooden handle!
You also know that some
things do not get too
warm even when they
touch something hot.
They are insulators.
An insulator is a material
that limits the amount of
heat that passes through
it.
Have you noticed that
many pots and pans have
wooden handles? That's
because wood is a great
insulator.
The raised hairs of Japanese macaque monkeys trap heat.
The monkeys share body heat to keep warm in the snow.
Wow! It sure
is getting hot
Have you felt how warm ain here!
kitchen gets when a stove is
on? The warmth is the result
of convection.
In convection, a gas or a
liquid moves from place to
place. A pattern of flowing
heat energy is a convection
current.
A convection current forms
when gas or liquid transfers
heat as it moves.
You know that the Sun is a
major energy source.
Every time you get warm in
the Sun, you feel radiation.
You feel it when you sit
near a fire too.
Radiation is energy that is
sent out in little bundles.
When radiant energy hits
you, the particles in your
skin move more quickly.
You feel warm.
Heat Energy Quiz
A(n) _____ limits the amount of heat
that passes through it.
conductor
Conduction
insulator
radiation
Convection
current
Oh no!
Quick choose
again!
Great work!
Heat Energy Quiz
_____ is one kind of energy that
travels from the Sun through space.
conductor
Conduction
Thermal
Energy
radiation
Convection
current
Oh no!
Quick choose
again!
Great work!
Heat Energy Quiz
A material that allows heat to pass
through it is a(n) _____.
conductor
Conduction
Thermal
Energy
radiation
Convection
current
Oh no!
Quick choose
again!
Great work!
Heat Energy Quiz
The transfer of energy by one object
touching another is _____.
conductor
Conduction
Thermal
Energy
radiation
Convection
current
Oh no!
Quick choose
again!
Great work!
Heat Energy Quiz
The total energy of all the particles in
a body is its _____.
conductor
Conduction
Thermal
Energy
radiation
Convection
current
Oh no!
Quick choose
again!
Great work! You
did it!
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