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Unit 13: Thermodynamics Page 10
Objectives
Lesson 2: Heat
Believe it or not, the concept of and so on increasing the
heat is really a bit tricky. What we temperature of the object.
call heat in common language, is · Convection is heat being
really not what heat is as far as
transferred by currents of
physics goes. Heat, in a way, moving gas or liquid caused
doesn’t exist. Nothing has heat.
by hot air/liquid rising and
Things can have a temperature. cold air/liquid falling.
They can have a thermal energy
but they can’t have heat. Heat is · Radiation is the transfer of
really the transfer of thermal heat by electromagnetic
energy. Or, in other words, the radiation, specifically infra-
movement of thermal energy from red radiation.
one object to another. Confused · Heat is movement of thermal
yet? energy from one object to
another.
Highlights:
· When an object absorbs heat
· Heat is the movement of it does not necessarily
thermal energy from one change temperature.
object to another.
· As objects change state they
· Heat can only flow from an do not change temperature.
object of a higher
· The heat that goes into
temperature to an object of a
something as it’s changing
lower temperature.
phases is used to change the
· Heat can be transferred from “bonds” between molecules.
one object to another · Objects release heat as they
through conduction,
freeze and condense.
convection and radiation.
· Objects absorb heat as they
· Conduction is the wiggle and evaporate and melt.
bump method of heat
transfer. Faster moving · Freezing points, melting
molecules bump into slower points, boiling points and
moving molecules speeding condensation points are the
them up. Those molecules “speed limits” of the phases.
then bump into other Once the molecules reach
molecules speeding them up that speed they must change
state.
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