Transcript Heat energy flows from warmer to cooler areas

Heat energy flows
from warmer to cooler
areas
Lesson 1.3
You will learn:
How heat is transferred in matter;
How the process of conduction
transfers heat;
How the process of convection
transfers heat
Heat flow by conduction requires
contact

Conduction is the
process that moves
energy from one
object to another
when they are
touching

Metals are good
conductors of heat

Insulators are poor
conductor of heat
Heat flow by convection involves
a flow of matter
Convection is the process that
transfers energy from place to place
by the motion of a gas or liquid
 Convection occurs in fluids

Density

A substance’s density
is a measure of the
amount of mass it
contains per unit
volume.

The density of
substance changes as
its temperature changes

Cold liquid is more
dense compared to
warmer liquid
Density and Convection Currents
 Convection
current is a pattern of
movement that occurs when a gas or
liquid rises as it becomes warmer in
one area and sinks as it becomes
cooler in another area
summer
fall