Thermal physics Flashcards
What are the three factors effecting pressure?
Volume, temperature and concentration
What happened to pressure as temperature changes at a fixed volume?
An increase in temperature means the gas will have more energy and cause more collisions therefore increasing pressure
What happens to pressure as volume changes at a fixed temperature?
As volume decrease there is less room for the particles and so there will be more collisions increasing pressure
What happens to a object as its temperature increases?
The average kinetic energy of all the particles in the object increases
What is specific heat capacity?
The energy required per unit mass per unit temperature increase. Or the energy required to heat 1kg of a material 1degree
What is the equation for specific heat capacity?
c = change in energy / mass x change in temp
Or
Change in energy = c x m x change in t
What is internal energy?
The total energy store by the particles making up as substance
What is the specific heat capacity of water
4200J/Kg/Degree
What are the three ways of heat transfer?
Convection
Conduction
Radiation
What is conduction?
Conduction is the method of transferring heat down a solid object.
This is done by lattice vibrations giving energy to neighbouring particles and the movement of delocalised electrons in metallic conductors
What is convection?
The transfer of heat through fluids.
As particles heat up they gain energy and move around
Particles that have energy will move from the hotter area to the cooler
So hot particles become less dense and rise
As they rise they loose energy and cool down
It creates a convection current
What is a radiation?
A heat transfer method that uses infrared waves to travel through a vacuum
