Heat Transfer: A Comprehensive Overview
HEAT TRANSFER
Heat is not a substance (matter)
—but a form of
energy.
Matter
Ener
g
y
≠
Heat is
energy.
Slow-moving
molecules have less
heat energy—what we
call cold.
Fast-moving
molecules
have a lot of heat
energy—what we call
hot.
To heat something up is to speed up its
molecules.
Heat (energy) can be transferred from object
to object.
Heat transfer:
The movement of heat from hotter objects to
colder objects through conduction,
radiation, and convection.
Conduction:
The transfer of heat between substances in
direct contact. If two objects touch,
energy is transferred from the hotter
object to the cooler object.
Conduction
Conduction occurs when a hot object comes in
contact with a colder object. The heat energy
from the hot object is transferred to the
colder object,
leaving the warmer object cooler
and warming the cooler object.
Mix the Heat Activity
Convection:
Liquids and gases rise as they get
heated and fall as they cool. Heat
is carried from place to place with
the movement of these fluids.
Convection occurs when an object transfers
its heat to another object through a medium,
such as water (a liquid), or air (a gas).
Convection
Radiation Activity
Radiation:
When electromagnetic waves hit an object
heat energy is transferred to the object.
Waves of radiation travel easily in a
vacuum as there are no obstacles.
Radiation does not rely upon any contact
between the heat source and the heated object.
For example, we feel heat from the sun even
though we are not touching it. Heat can be
transmitted though empty space by thermal
radiation.
Radiation
Heat transfer is a fundamental concept in physics, where energy moves from hot to cold objects through conduction, radiation, and convection. Heat is not a substance but a form of energy that speeds up molecules. Conduction transfers heat between substances in direct contact, while convection involves the movement of fluids. Radiation occurs when electromagnetic waves transfer heat to objects. Explore the various methods of heat transfer and their impact on temperature changes.
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Presentation Transcript
Heat is not a substance (matter) energy. but a form of
Heat is energy. Fast-moving molecules have a lot of heat energy what we call hot. Slow-moving molecules have less heat energy what we call cold. To heat something up is to speed up its molecules.
Heat (energy) can be transferred from object to object. Heat transfer: The movement of heat from hotter objects to colder objects through conduction, radiation, and convection.
Conduction: The transfer of heat between substances in direct contact. If two objects touch, energy is transferred from the hotter object to the cooler object.
Conduction Conduction occurs when a hot object comes in contact with a colder object. The heat energy from the hot object is transferred to the colder object, leaving the warmer object cooler and warming the cooler object.
Convection: Liquids and gases rise as they get heated and fall as they cool. Heat is carried from place to place with the movement of these fluids.
Convection Convection occurs when an object transfers its heat to another object through a medium, such as water (a liquid), or air (a gas).
Radiation: When electromagnetic waves hit an object heat energy is transferred to the object. Waves of radiation travel easily in a vacuum as there are no obstacles.
Radiation Radiation does not rely upon any contact between the heat source and the heated object. For example, we feel heat from the sun even though we are not touching it. Heat can be transmitted though empty space by thermal radiation.
