# Energy Matters: Heat in the Home

 what is heat? heat is a form of energy that is measured in joules (J) what is temperature? temperature is how hot or cold an object is and is measured in degrees Celsius in what three ways can heat be transferred? conductionconvectionradiation what is conduction? the vibrations of hot particles are passed to their neighbours.takes place in solids what is convection? hot fluids are less dense than cold fluids and so they can rise while the cold fluid falls setting up a convection current. takes place in liquids and gases. what is radiation? energy in the form of electromagnetic rays.only method through a vacuum Why does heat loss happen? heat always moves away from hot objects to cold objects what does the rate of heat loss depend on? the temperature difference between the two objects heat loss from the home be reduced by loft insulation. explain. reduces heat loss by conduction through the ceiling heat loss from the home be reduced by double glazing. explain. a vacuum between the panes of glass reduces heat loss by conduction heat loss from the home be reduced by draught excluders. explain. reduce heat loss by convection heat loss from the home be reduced by foil-backed plasterboard. explain. reduces heat loss by radiation from the walls heat loss from the home be reduced by foil-backed radiators. explain. reflects heat back into the room and so reduces heat loss by radiation heat loss from the home be reduced by cavity wall insulation. explain. a foam filling between the walls prevents heat loss due to convection heat loss from the home be reduced by carpets. explain. reduces heat loss by conduction through floor what is specific heat capacity? the quantity of heat energy required to raise the temperature of 1kg of a material by 1 oC what happens when a material changes state? when a material changes state energy is either lost or gainedduring a change of state the temperature of a material does not change what is the specific latent heat of fusion? the quantity of heat energy required to melt 1kg of a material what is the specific latent heat of vaporisation? the quantity of heat energy required to evaporate 1kg of a material what is the unit of specific latent heat? J/kg what applications involve a change of state? refrigerators picnic box cooling packs during any energy change, what cant happen? energy cant be created nor destroyed Authorcrobertsonx ID86561 Card SetEnergy Matters: Heat in the Home DescriptionEnergy Matters: Section 4- Heat in the Home Updated2011-05-18T13:57:21Z Show Answers