8 - Thermal Energy

The transfer of heat from one substance to another through direct contact is

CONDUCTION.

A(n) ____ is a material that allows heat or electricity to pass through it easily

CONDUCTOR

The transfer of heat through currents caused by the warming and cooling of liquids and gases is

CONVECTION

You feel the hot sand on your feet as you walk barefoot along the beach. What type of heat transfer is happening between your feet and the sand

Conduction

You are supposed to get low toward the floor if you are ever caught in a building or house fire. The hotter air and smoke will rise and the cooler air will sink. What type of heat transfer does this represent

Convection

Chocolate melting in your hands is an example of convection

FALSE

Conduction most commonly occurs with liquids and gases

FALSE

Ice cubes, ice packs, and other freezing objects have no thermal energy

FALSE

In order for radiation to occur electromagnetic waves must travel through matter to transfer energy from one substance to another

FALSE

Steam rising from a bowl of hot soup is an example of conduction

FALSE

When you open the door to a refrigerator, thermal energy flows from the cooler air inside the refrigerator to the warmer air outside

FALSE

The form of energy associated with the movement of atoms and molecules in a material is

HEAT

The movement of thermal energy from one substance to another is

HEAT TRANSFER

A(n) ____ is a material that slows or stops the flow of energy and does not allow heat or electricity to pass through it easily

INSULATOR

Your mom just finished baking cookies for a birthday party. She turned off the oven and left the oven door open. What will happen to the temperature of the oven over the next 30 minutes

It will decrease until it reaches room temperature.

The transfer of heat through electromagnetic waves is

RADIATION

During the cold winter months, you like to sit in front of the fireplace to feel the warmth from the fire. What type of heat transfer does this represent

Radiation

The point when substances have reached the same temperature and heat no longer flows between them is

THERMAL EQUILIBRIUM

A hot cup of coffee sitting on the counter will eventually reach room temperature after a few hours

TRUE

Convection does not occur in solids because the particles of solids are too tightly packed

TRUE

Copper wire and metal cooking utensils are good conductors of heat and electricity

TRUE

Heat always transfers from substances with more thermal energy to substances with less thermal energy until both substances reach the same temperature

TRUE

The particles of an object with more thermal energy move faster than the particles of an object with less thermal energy

TRUE

The three main types of heat transfer are conduction, convection, and radiation

TRUE

What is heat

The movement of atoms and molecules in a material.

Heat moves between two substances until they both reach the same temperature. What is this process called

Thermal Equilibrium

How does thermal energy flow

Thermal energy flows from an object with more thermal energy to an object with less thermal energy.