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80 terms

PRACTICE Examples of Conduction, Convection, and Radiation

STUDY
PLAY
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
radiation
A person placing their cold hands over a warm fire
radiation
A person placing their hand over a hot burner
radiation
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
conduction, convection, radiation
ways to heat the atmosphere
conduction
transfer of energy through matter using direct contact
poor conductor
air
good conductor
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
radiation
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)
radiation
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
radiation
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)
radiation
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
radiation
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
Heat energy can be transfered in three ways
Conduction, Convection, Radiation
Conduction occurs between objects in
direct contact
Thermal Conduction
transfer of energy as heat through a material
Conduction takes place when objects are in direct contact are
different temperatures
Convection results from the movement of
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
Radiation does not require
physical contact
Radiation
energy that is transferred as electromagnetic waves, such as visible light and infrared waves
Conductor
material which energy can be easily transferred as heat
Material thats a good conductor
cooking Pans
Insulator
material that transfers energy poorly
Material thats good insulator
warm clothing
Energy transferred through partical collisions
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
Which substance shown has the highest specific heat
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.
Radiation
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.
What are the 2 forms of energy?
1. Potential
What are the three main types of heat transfer?
Conduction, convection, radiation
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
Radiation
Transfer of heat through electromagnetic radiations
Name two examples of conduction
Your hand touching a hot dish, You burn your hand
Name two examples of convection
a heater, boiling water
Name two examples of radiation
the sun on your skin, warmth of the fire