Heating and cooling Flashcards
1
Q
What substances can convection happen in?
A
Liquids and Gases
2
Q
What type of radiation do all hot objects emit?
A
Infra red radiation
3
Q
What are the best absorbers of thermal radiation?
A
Black, dull surfaces
4
Q
What are the worst emitters of thermal radiation?
A
Light, shiny surfaces
5
Q
How does heat pass through a single pane of window glass?
A
By conduction and radiation
6
Q
can liquids be compressed?
A
They cannot be compressed because their particles are close together.
7
Q
How do you work out energy using specific heat capacity?
A
mass x specific heat capacity x change in temperature
8
Q
What are temperature and energy measured in?
A
Temperature is measured in °C and energy in J
9
Q
Insulating a home costs £1800 and saves £50 a year. What is the payback time?
A
36 years
