Energy transfere by heating Flashcards
What is infrared radiation?
Infrared radiation is a type of electromagnetic radiation, which involves waves rather than particles
What do all objects emit and absorb?
Thermal radiation, also known as infrared radiation
Which is the best surface to emit and absorb infrared radiation?
A dark matt surface
Which is the worst emitter and absorber of infrared radiation?
Light shiny surfaces
What is the arrangement and movement of particles in a solid?
Close together in a regular pattern. Vibrate in a fixed position.
What is the arrangement and movement of particles in a solid?
Close together in a random pattern. They move around each other.
What is the arrangement and movement of particles in a gas?
Far apart and in a random pattern. They move quickly in any direction.
How can heat energy move through a substance?
By conduction
What are poor conductors of heat called?
Insulators
What materials are poor conductors?
Non-metals and gases
Why are metals good conductors?
Because they have free electrons that Cary energy.
Why are non-metals generally poor conductors?
Because they rely on atomic vibrations to carry energy
When does convection occur?
When particles with a lot of heat energy in an a liquid or gas move and take the place of particles with less heat energy.
How is heat transferred from hot places to cool places?
By convection
Why do liquids and gases expand when they are heated?
Because the particles move quicker when they are heated than they do when they are cold.
What are evaporation and condensation?
Changes of state
What is evaporation?
The change of state from a liquid to gas
Why does evaporation happen?
In a well-ventilated room molecules in the air aren’t likely to re-enter a liquid which is warmed by the sun lights, therefore the liquid evaporates.
Why does condensation happen?
Condensation occurs when particles cool down and are framed into a liquid at a cool surface (such as your window).
What are some different forms of energy?
Magnetic Sound Kinetic Gravitational potential Light Chemical Heat Electrical Elastic potential Nuclear
What does an energy transfer diagram show?
Show the useful energy transfer
Process
Energy in –> –> Energy output
(Type of energy in) What it is (Type of energy out)
What do Sanky diagrams do?
Summarise all the energy transfere taking place in a process. The thicker the line or arrow, the greater the amount of energy involved.
