energy transfer by heating Flashcards
how does conduction work
when one vibrating particle is heated, it will vibrate more rapidly and spread this to its surroudning particles and etc until, the amount of vibrations are evenly spread. this is best w solids because theyre close together
what works best with thermal conductivity
metals
what is thermal conductivity
how well an object transfers heat energy by conduction per sec
what does energy transfer depend on
thickness
thermal conductivity
required practical insulation explained
so theres a small beaker in a big beaker and acarboard lid with a thermometer hole which goes in the small beaker with the hot water in it. start stopwatch and record every three minutes for fifteen. repeat this with different insulators in the gap between beakers, always use the same mass
independant variables
what changes
dependant variables
measured
controlled variables
doesnt change
whats specific heat capacity
energy needed to raise the temp of 1kg by one degree
energy thermal transfer equation
e= m c delta feta
or energy equals mass x spec heat cap x change in temp
what dies internal energy comprise of
kinetic
potential
whats temp a measure of
the overall kinetic energy of particles in an object
whats a fluid
an area where particles are free to move like liquids and gases
how do caivty walls work
houses can have two layers of brick with an air gapfilled with foam between them, this gap stops the loss of heat throguh conduction (a solid) as air cannot conduct via conduction but also stops it throguh the air via convection as there are only small but frequent air bubbles in the foam
how do double glazed windows work
theres a small air gap which stops the loss of heat via conuction as gas air cannot carry it
