Transfering Heat Energy Flashcards
what is a particle model used for
to help explain how some forms of energy travel
what does theory suggest about particles
that every thing is made up of moving or vibrating particles
how does a material expand
when the particles are heated, they move faster and faster so they take up more room. so the material expands
how can heat energy be transferred
conduction, convection and infrared radiation
where does conduction take place
takes place in solids but also in liquids but not very well
how does conduction take place in solids
The particles in a solid are held together tightly. When they gain energy they vibrate faster and further,
and the vibrations are passed on.
what are type of conductors are solids
metals are the best conductors but most other solids are poor conductor
how does conduction take place in liquids
Particles are not as close in a liquid, so conduction is not very good. Particles are a long way apart
in gases, so gases hardly conduct heat at all.
why doesn’t conduction take place in gasses
Particles are a long way apart in gases, so gases hardly conduct heat at all.
where does convection take place
takes place in fluids (liquids and gasses)
how does convection work
When the air near the fire is heated, the particles spread further apart and the air becomes less dense and rises. As it rises it meets cooler air and passes the energy on. Having passed on the energy, it cools and becomes denser. The denser air sinks, setting up a cycle or convection current
where does infrared radiation take place
can transfer heat energy through empty space. Radiation does not require the movement of particles
how does infrared radiation take place
Any hot or warm object gives off or emits radiation. When something takes in heat energy from radiation, it is said to absorb it.
how is infrared radiation similar to light
It can be absorbed or reflected, and it can also be focused.
