Dr Ross




Today we will be revising...




 

evaporation


condensation


heat flow



A trip to my nan's...






evaporation


condensation

factors that affect evaporation and condensation




surface area exposed 

temperatures of the liquid and gas 

temperatures of solid surfaces 

sources of heat energy

saturation

movement of air 




THE FLOW OF HEAT

heat flows from HOT to COLD
2nd law of thermodynamics

HEAT TRANSFER


The surface area of an object plays an
 important role in how it loses heat

Cooling down Nan's cuppa

FACTORS affecting HEAT TRANSFER


the volume and shape of the material or its container

the surface area available for heating or cooling

the thermal conductivity of the materials involved

the thickness of any containers

the temperature differences

 HEAT TRANSFER in the natural world





adaptation   thermo-regulation transpiration


balancing heat flow

through the body

stay cool                                 stay warm 


USING WHAT YOU NOW KNOW


How does wind help in drying clothes?






The transfer of energy through heat drives evaporation and condensation.
Heat energy moves from hot to cold. The higher the temperature difference between two materials, the higher the rate of heat transfer. 
Think about the different factors that can affect the rate of heat transfer - most you know from your own experience.


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