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6.P.3A.5 Convection, Conduction, and Radiation

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Michele Bahm

on 29 November 2017

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Transcript of 6.P.3A.5 Convection, Conduction, and Radiation

Recall:
heat moves easily from one object to another through direct contact in some materials (called conductors) and not so easily through other materials (called insulators).
Convection, Conduction, and Radiation
Conduction:
Conduction involves objects in direct
contact
.

The transfer of energy as heat occurs between particles as they collide within a substance or between two objects in
contact
.

All materials do
not
conduct heat energy equally well.
Conduction continued:
Poor conductors of heat are called
insulators
.

The energy transfers from an area of
higher
temperature to an area of
lower
temperature.

For example, if a plastic spoon and a metal spoon are placed into a hot liquid, the handle of the metal spoon will get hot quicker than the handle of the plastic spoon because the heat is conducted through the metal spoon better than through the plastic spoon.
Convection:
Convection is the transfer of energy as heat by
movement
of the heated substance itself, as
currents
in fluids (liquids and gases).

In convection, particles with
higher
energy move from one location to another carrying their energy with them.
Convection continued:
Heat transfer occurs when particles with higher energy move from warmer to
cooler
parts of the fluid.

Uneven

heating
can result in convection, both in the air and in water. This causes currents in the atmosphere (wind) and in bodies of water on earth which are important factors in weather and climate.
transfer of energy through space
without
particles of matter colliding or moving to transfer the energy.

This radiated energy warms an object when it is
absorbed
.


●Radiant heat energy moves from an area of
higher
temperature to an area of
cooler
temperature.


Energy transfer as heat can occur in three ways:
Conduction

Convection

Radiation
Radiation
Various individual materials and/or combinations of materials affect how
quickly
heat transfers by conduction, convection, or radiation.
Conductors are materials that
easily
carry heat or electric current.

○ Glass and
metals
are good conductors of heat. When a metal pan is placed on a heat source, it will quickly get hot and conduct the heat to whatever is inside of the pot.

● Insulators are materials that are
poor
carriers of heat or electric current.

○ Wood and animal
fat
(blubber) are good insulators; they do
not
conduct heat very well. A polar bear swims in freezing water but the bear does not freeze to death like a human would. The bear’s thick layer of fat insulates the bear and traps heat inside of the bear’s body.

Now it's the dogs'
turn!!!
Remember this???
Full transcript