__________________________ __________________________ __________________________ Heat energy always moves from a _ _ _ place to a _ _ _ _ _ _ place. The three methods of heat transfer are: This type of heat transfer only happens in this state of matter: This type of heat transfer only happens in these two states of matter: Type of heat transfer where heat energy is transferred by particles to neighbouring particles A thermos flask is made from silvered glass and also contains a vacuum. How does this help to keep the contents of the flask hot/cold? Heat transfer Type of heat transfer where heat energy is carried by particles Type of heat transfer that does not require particles. Therefore can happen in a vacuum. The rising of hot air/liquid and the falling of cold air/liquid is called a _ _ _ _ _ _ _ _ _ _ / _ _ _ _ _ _ _ Hot air/liquid rises because: Cold air/liquid sinks because: This type of heat transfer is affected by the colour of surfaces. These types of surfaces absorb heat energy How does double glazing reduce heat loss in a house? These types of surfaces reflect heat energy The formation of convection currents is due to changes in density. Density can be described as the _ _ _ _ _ _ _ _ _ of _ _ _ _ _ _ _ _ _. The closer the particles the _ _ _ _ _ _ the density.