Unit 11 Flashcards
Thermal energy transfer in liquids and gases is mainly by another method known as
Convection
When air is heated it ….. and so its density …..
Expand, decrease
The warm air is less dense than its surroundings, so it…. Upwards
Rises
When air is cooled, it… and so its density….
Shrinks, increase
Convection can happen in?
Liquid & gasses
Convection can happen in liquid and gases because?
Particles are free to move
Convection cannot happen in a?
Solid
Convection cannot happen in a solid because the particle?
Can only vibrate about fixed position
Convection cannot happen in a vacuum as there are
No particles to move,
The cold air is denser than its surroundings, so it
Sink downwards
In convection, energy is transferred through a material from a warmer place to a cooler place by?
The movement of the material itself
In conduction, energy is transferred through a material from a warmer place to a cooler place without..
The material itself moving
Warm air rases as it becomes … dense
Less
Cooler air falls as it becomes … danse
More
Convection is the main method of thermal energy transfer in fluids.
Thermal energy can be conducted through a liquid but this is generally a …. compared with convection.
Slow process
