Unit 9 Thermodynamics Flashcards
(22 cards)
Heat
The energy transfer without the action of a macroscopic force
Work
Energy transfer produced by the action of a macroscopic force
First Law Of Thermodynamics
The internal energy of a system can only change by exchanging energy with its surroundings, either by doing work or heating
Thermal Equilibrium
State in which there is no net transfer of energy between parts of the system. All parts of the system are at an equal, constant temperature
Steady State
Constant rate of energy flow and constant temperature but not in thermal equilibrium
Temperature
Measure of average kinetic energy of the particles
Brownian Motion
Random motion of particles due to random forces acting on them
Heat Capacity
Physical property determining amount of energy required to bring about a temperature change
Molar Heat Capacity
Energy required to raise 1 mol of substance by 1 Kelvin
Specific Heat Capacity
Energy required to raise 1 kg of material by 1 Kelvin without changing its state
Specific Latent Heat
Amount of energy required to change the state of 1 kg of material
Specific Latent Heat Of Fusion
Solid to Liquid
Specific Latent Heat Of Vapourisation
Liquid to Gas
Latent heat of a substance
Amount of energy released/absorbed when a phase change takes place
Pressure Of Gas
Caused by particles of gas colliding with walls of container
Volume Of Gas
Total space in which particles are free to move about
Mass Of Gas
Total Mass Of Particles
Kinetic Theory
Explains property of gases in terms of motions of the particles that make up the gas.
Attempts to explain macroscopic behaviour in terms of microscopic behaviour
BlackBody Radiator
Perfect emitter and absorber of all possible wavelengths of radiation
Stefan’s law
States that power output (Luminosity) of a blackbody is directly proportional to its surface area and absolute temperature ^4
Wien’s Displacement Law
States that the peak wavelength of emitted radiation is indirectly proportional to the absolute temperature of the object
Peak Wavelength
Wavelength of light released at maximum intensity
