What happens to the density of a gas when it is heated?
It becomes less dense.
What happens to hotter less dense air when surrounded by cooler more dense air?
The hotter less dense air rises.
Which of the 3 processes of thermal energy transfer is the gap in a cavity wall preventing?
conduction
Which of the 3 processes of thermal energy transfer is the silver coated foam in a cavity wall preventing?
Convection and radiation
What is in between the atoms of a metal which make metals such a good conductor of thermal energy?
Free electrons
Why did old coal mines light a fire at the bottom of one of their two shafts?
To create a convection current and get fresh air into the mine
Why can a thermal imaging camera see images even when it is dark?
The camera detects the thermal radiation being given off all objects.
Which colour material would be a good absorber and emitter of thermal radiation
Matt black
