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Flashcards in Heating Houses Deck (15):
0

Heat measures...

Energy
on an absolute scale

1

Temperature measures

How hot something is using a chosen scale

2

Heat flows from...

Hot to cold

3

If an object's temperature rises, does it give out or take in heat energy

Takes in

4

If an object's temperature falls, does it give out or take in heat energy

Give out

5

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)

6

With high temperature what happens to the molecules

They vibrate with kinetic energy. Higher temperature means more kinetic energy

6

In a thermogram what colour are the windows

White (hottest)yellow or red
Most heat escaping

7

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

7

On a thermogram what colour is the well-insulated loft

Black (coldest) dark blue or purple
Least heat energy escaping

9

What is specific heat capacity

Energy required to raise the temperature of 1kg of material by 1'c

10

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

11

Specific latent heat is...

Amount of heat energy required to boil/melt 1kg of a material

12

Which has a higher specific heat capacity liquid or solid

Liquid

Takes more energy to raise 1'c for liquid than soild

13

How will two layers of brick walls in a house reduce energy loss

Air is trapped between the layers and acts as an insulator