Heating Houses Flashcards
Temperature measures
How hot something is using a chosen scale
Heat measures…
Energy
on an absolute scale
Heat flows from…
Hot to cold
If an object’s temperature rises, does it give out or take in heat energy
Takes in
If an object’s temperature falls, does it give out or take in heat energy
Give out
Describe the speed of cooling for a very hot object in room temperature
Describe the speed of cooling for a cooler object in room temperature
Cools very quickly at a faster rate
It cools at a slower rate
(Higher temperature in an object has higher average kinetic energy of the molecules)
With high temperature what happens to the molecules
They vibrate with kinetic energy. Higher temperature means more kinetic energy
In a thermogram what colour are the windows
White (hottest)yellow or red
Most heat escaping
The amount of energy needed to raise temperature of an object depends on:
Object mass
Change in temperature required
Specific heat capacity of object material
On a thermogram what colour is the well-insulated loft
Black (coldest) dark blue or purple
Least heat energy escaping
What is specific heat capacity
Energy required to raise the temperature of 1kg of material by 1’c
When heating a material, when does temperature NOT rise any more
When material is CHANGING STATE
The heat energy is being used to break
intermolecular bonds
Specific latent heat is…
Amount of heat energy required to boil/melt 1kg of a material
Which has a higher specific heat capacity liquid or solid
Liquid
Takes more energy to raise 1’c for liquid than soild
How will two layers of brick walls in a house reduce energy loss
Air is trapped between the layers and acts as an insulator
