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.