Materials such as silver, copper, and gold are good conductors of heat, while glass, rubber, and paper are poor conductors or insulators. Conductors transfer heat through direct contact, while insulators prevent heat transfer. Insulators are used in applications like pot holders, house construction, and insulation to reduce heat transfer. The three main methods of heat transfer are conduction, convection, and radiation.
8. Uses of Conductors and Insulators
– Pot holders are made of materials such as
fabric and silicon, they can safely hold pots
that are in contact with the heat source.
– Houses made of glass and wood are cool
even without air conditioning.
– Nipa, is an insulating material that makes
the interior of the house comfortable even
at the peak of a hot day.
– Insulating foam or plastic is used to houses
made of cement and metal roofing to
release excess heat and prevent outside
heat to get in.
9. Methods of Heat Transfer
• Conduction – happens when something
hot touches something cooler, causing
heat from the hotter object to travel
to the cooler object.
Example:
10. • Convection – occurs when heat is
transferred through a gas or liquid as the
hotter material moves to a cooler area.
– the reason that water moves
around so much as it’s boiling. As the water at
the bottom of the pot becomes hot, it rises to
the top, with cooler water moving down to
replace it.
Example:
11. • Radiation – is when heat travels
through the air in invisible waves.
– Heat transferred through
radiation is called “radiant heat”
Example:
12. Properties of Objects that
Affects Radiant Heat
Dark-colored objects absorb radiant heat
better than colored ones. They are also
good emitters of heat.
Light-colored, shiny objects reflect most
of the heat, making them good reflectors
of radiant heat.
