physics

Created by

Sophia Hill

Cards (16)

what is conduction  
the transfer of heat from a hotter region to a cooler one through a solid
do substances move as a whole in conduction  
no
what happens when particles are heated
The particles vibrate more vigorously when they are heated and the heat energy is then transferred from one particle to the next.
why are metals good conductors of heat
they contain free electrons
what do free electrons gain
they gain kinetic energy and therefore move faster
how do free electrons give energy to over particles
They move through the metal quickly and transfer this energy to other particles by collisions.
what are the four ways thermal energy can be conducted
conduction, convection, radiation, evapouration
what is convection?  
the movement or heat energy in a liquid or gas
what happens to heat energy during convection 
The heat energy is transferred from a hotter area to a cooler area.
when happens to fluids in convection when they are heated
When the fluid is heated, it expands, and becomes less dense than its surroundings. It then rises, and cooler liquid or gas fall to take its place.
what are some examples of convection
kettle, radiator
what makes a good insulator
when they have trapped air
what is air a poor conductor
as it is a gas
why does trapped air make things good insulators
Since the air is trapped, like in bubble wrap, the gas particles cannot move around. Convection cannot take place either.
what is insulation
The energy transfer per second through a layer of insulating material depends on The temperature difference
The thickness of the material
The thermal conductivity of the material
what is fibre  
tiny bits of glass