# PRACTICE Examples of Conduction, Convection, and Radiation

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### conduction

A pot sitting on a hot burner.

### convection

How the inside of a greenhouse works.

### conduction

Touching a metal spoon that is sitting in a pot of boiling water

### conduction

Using a heating blanket to get warm

A person placing their cold hands over a warm fire

A person placing their hand over a hot burner

Lying out in the sun to get a tan

### convection

Putting your wet shoes on a floor vent to dry them faster

### conduction

Picking up a hot cup of coffee

### convection

Macaroni rising and falling in a pot of boiling water

### thermal energy

produced by the total energy of the particles that make up an object

### true

all atoms have thermal heat energy because the atoms or molecules that make matter are in constant motion

### temperature

average motion of the atoms and molecules that we sense

### heat energy

the energy that flows due to temperature differences;always transferred from warmer to cooler substances

ways to heat the atmosphere

### conduction

transfer of energy through matter using direct contact

air

metal

### conduction

energy is transferred by direct contact

### convection

heat transfer by the movement of mass from one place to another;can take place only in liquids and gases

### convection

moves about the planet heat gained by conduction and radiation from the sun;heating of the Earth isn't even

only way heat is transferred that can move through the relative emptiness of space

### conduction and convection

require motion of molecules like air or water to move heat

### convection

the transfer of heat by the actual movement of warmed energy in a gas or liquid by movement of currents. (It can also happen in some solids, like sand)

electromagnetic waves that directly transport energy through space;sunlight is a form of this that brings heat to our planet without the aid of anything

### convection

energy is transferred by the mass motion of molecules

energy is transferred by electromagnetic radiation

### conduction

the transfer of heat within a substance by direct contact

### convection

transfer of heat by physical movement of the heated substance itself (vertical movement)

transfer of heat from the Sun to the Earth's atmosphere

### conduction

transfer of heat from the Earth's surface to the Earth's atmosphere

causes some of the Earth's heat to be lost back into space

### convection

main driving force for the transfer of heat between air masses

### cloudy days

Clouds reflect the sun's heat away from the Earth, thus it makes the day cooler

### volcanoes

created by the Earth from some of the heat from the sun

### Cloudy nights

clouds form a blanket which keeps the heat from escaping back into the atmosphere. The heat stays in keeping us warmer.

### Clear nights

heat from the Earth is able to escape back into the atmosphere;cooler nights

### clear days

no clouds to reflect the sun's heat away from the Earth; day is warmer

### Conduction is...

heat transfer through contact

### why do different metals conduct heat different rates

different materials have different conductivites

### most conductive to least conductive metal

Copper, Aluminum, Brass, Steel

direct contact

### Thermal Conduction

transfer of energy as heat through a material

### Conduction takes place when objects are in direct contact are

different temperatures

warm fluids

### Convection

movement of matter due to differences in density that are caused by temp. variations can result in transfer of energy as heat

physical contact

energy that is transferred as electromagnetic waves, such as visible light and infrared waves

### Conductor

material which energy can be easily transferred as heat

cooking Pans

### Insulator

material that transfers energy poorly

warm clothing

heat

### Why are gases poor conductors

Their particals are so far apart

### What makes a substance a good or poor conductor depends in part on

how much energy is required to change the temperature of the substance by certain amount

### Specific heat is a characteristic

physical property

### Specific heat of any substance is the amount of energy required to raise the temperature of

1 kg of that substance by 1K

water

### Thermal Expansion

Matter expanding when its temperature is raised.

### Insulation

Preventing heat from flowing in or out of a material.

### Convection

Transfer of energy by the flow of a liquid or a gas.

### Conduction

Molecules of energy travel through a solid.

### Potential Energy

Energy stored in an object or material.

### Melting

The changing of a solid (ice cube) to a liquid (water).

### Kinetic Energy

The energy of a moving object.

### Vaporization

The changing of a liquid to a gas.

### Condensation

The changing of a gas to a liquid.

### Evaporation

The vaporization of molecules from the surface of a liquid.

The transfer of energy by electromagnetic waves.

### Freezing

The changing of a liquid (water) to a solid (ice cube).

### Boiling

Bubbles of vapor escape from a liquid as a result of heating.

1. Potential

### Conduction

Energy is passed from atom to atom through direct contact

### Convection

Method of heat transfer of thermal energy by fluid circulation of the movement of atoms

Transfer of heat through electromagnetic radiations

### Name two examples of convection

a heater, boiling water

### Name two examples of radiation

the sun on your skin, warmth of the fire

Example: