Heating And Cooling Flashcards
0
Q
What type of radiation do all hot objects emit
A
Infra-red radiation
1
Q
What substances can convection happen in
A
Liquids and gases
2
Q
What are the best absorbers of thermal radiation
A
Black, dull surfaces
3
Q
What are the worst emitters of thermal radiation
A
Light, shiny surfaces
4
Q
How does heat pass through a single pane of window glass
A
By conduction and radiation
5
Q
What is energy measured in
A
Joules (J)
6
Q
He specific heat capacity of water is 4181 J/Kg/C and that of lead is 128 J/Kg/C. What does this mean:
A
More energy is needed to heat water than is needed to heat the same mass of lead by the same amount
7
Q
Insulating a home costs £1800 and saves £50 a year. What is the payback time?
A
1800 ➗ 50
36 years
