energy transfers by heating

• what does a material thermal conductivity tell you?

  how well it conducts heat
• which materials have a low thermal conductivity

  thermal Insulators
• give three factors that determine the rate of thermal energy transfer through a material

  Thermal conductivity of material

  Temperature difference

  Thickness of material
• define specific heat capacity

  Amount of energy needed to raise the temperature of 1 kg of a material by 1°
• what is infrared radiation?

  Type of electromagnetic radiation
• what is the relationship between the temperature of an object and it's emisson of infrared radiation?

  The higher the temperature of an object the more infrared radiation emitted in a given time
• you tell about object that absorbs and infrared radiation at the

  It's a constant temperature
• compare the amount of infrared radiation emitted and absorbed by an object that is increasing in temperature

  more infrared radiation absorbed than emitted
• name 3 greenhouse gases

  Water vapour

  Carbon dioxide

  Methane
• human activities increase the levels of greenhouse gas

  Deforestation

  Burning fossil fuels

  cow farming
• why do greenhouse gases increase the earths temperature?

  Earths surface absorbs and free emits radiation from the sun which greenhouse gases that absorb radiation back towards earths surface