Transcript Heat and it’s transfer - Mr. Oey's Science Classes

Intro to Heat
Mr. Oey
Heat
Heat is kinetic energy in a substance. Heat is
the motion of the molecules in a substance,
not the motion of the substance itself.
Energy that flows between two objects
because of a difference in temperature. For
example, a metal spoon in hot water.
Measuring Heat
Celsius
Fahrenheit
Freezing: 0 degrees
Freezing: 32 degrees
Boiling: 100 degrees
Boiling: 212 degrees
Heat Movement
Molecules move from places of higher
temperatures to places with lower temperatures
Thermal Equilibrium
Molecules move from warm to cold until
they reach a balanced temperature
This balance is called thermal equilibrium.
Vocabulary
Insulator
an object that reduces the
transfer of heat
Conductor
an object that easily allows
the transfer of energy
Vocabulary
Solid
particles
vibrate in one
place
Liquid
particles spin
and move
closely
together
Gas
particles
spin and
move fast
and far
away from
each other
Vocabulary
Expansion
as molecules are heated
they spread out as they
move around quickly and
cause objects to become
larger (expand)
Heating = Bigger
Contraction
as molecules are cooled
they move closer together
and cause objects to shrink
(contract)
Cooling = Smaller
Vocabulary
Conduction
the transfer
of heat by
direct
contact
between
solids
Convection
 Transfer of
heat in
liquids &
gases
 Heat rises
Radiation
 Transfer of
heat in
empty
space w/o
any
particles
Examples
Conduction
A pot
heating on a
stove
Convection
 Boiling
water
 Heating a
home
Radiation
 Sun’s rays
heating a
car