TP Flashcards
Arrange solids, liquids and gases in the order of how much they expand from most to least
Gas -> liquid -> solid
What is heat
Heat refers to the amount of energy transferred from a region of higher temperature to a region of lower temperature
What is temperature
Measure of how cold/hot an object is
State the SI units of heat and temperature as well as what they are written as
Heat: Joule; J
Temp: Kelvin, K
What does temperature relate to at a particle level
Average kinetic energy of particles
What does thermal energy relate to at a particle level
Number of particles
What is conduction
The transfer of heat through a medium without the physical movement of the medium
Explain, in terms of movement of particles, how heat is transferred through a solid
When heated, particles gain kinetic energy and vibrate more vigorously at their fixed positions and collide with neighbouring particles, transferring kinetic energy from one particle to another.
(for metals) Metals have free electrons which move to cooler regions and transfer kinetic energy to other particles upon collisions
Why are solids generally better conductors of heat
The particles of a solid are more closely packed together, hence collisions are more frequent, and the rate of heat transfer is higher
Why are metals good conductors of heat
They possess free moving electrons which travel through the metal to other particles to help transfer energy
What is convection
Convection is the transfer of heat from one place to another by the physical movement of a medium
What causes convection
Convection currents due to a difference in density
What is radiation
Radiation is the transfer of heat in the form of infrared radiation without the need of a medium
