HEAT AND HEAT TRANSFER

Before We Begin…. Write down the following questions to answer

throughout the powerpoint 1. What does the law of conservation of

energy state? 2. How does the motion of molecules relate to temperature? 3. Heat is always transferred from a ______ object to a ________ object4. What are the three ways in which heat is

transferred?

5. What is an example of a phase change?

Law of Conservation of Energy

The law of conservation of energy states that energy may neither be created nor destroyed. Therefore the sum of all the energies in the system is a constant.

The motion of molecules produces heat

The more motion, the more heat that is generated

Heat is transferred from warmer objects to colder objects.

Heat can be transferred in several different ways.

The three forms in which heat can be transfered: Conduction,

Convection Radiation

Conduction involves the transfer of heat through

direct contact

Convection is the transfer of heat from one place to another by the movement of fluids

Radiation is the transfer of heat through space. For example, heat

energy from the sun being transferred to earth is radiation

Heat and Phase Changes

A phase change is a physical change that occurs when a change in the amount of heat energy is involved.

A phase change occurs with the addition or removal of heat

Heat expansion

The expansion of a substance due to heat

Most solids, liquids, and gases expand as they are heated