Heat Flashcards
What is temperature?
The measure of the average KE of the particles of an object.
What is temperatures variables?
Does not vary with mass.
What is thermal expansion?
The increase of the volume of a substance due to an increase in the temperature. (Heat makes lower temperature objects expand.)
What is the SI unit of temp?
Kelvin=K
Freezing temps of water?
32°F, 0°C, 273 K
Boiling temps of water?
212°F, 100°C, 373 K
What is absolute zero?
The lowest temp on the kelvin scale= 0 kelvin= no particle motion (Called 0K).
What is heat?
The process of transferring energy between objects which are at two different temps. The thermal energy ALWAYS goes from the higher temp object to the lower temp object until both objects are at the same temp which is called thermal equilibrium.
Heat variables?
Varies with mass and temp and specific heat capacity
What is thermal energy?
The total KE of all the particles which make up the whole substance.
Thermal energy variables?
Varies with mass and temp.
What is the SI unit of thermal energy?
Joules= J
What is thermal equilibrium?
When energy is transferred from a higher temp object to the lower temp object until both are at the same temp.
What is conduction?
The transfer of energy from one substance to another through direct contact.
What is a conductor?
Substances that conduct thermal energy very well.
Conductor example?
Iron skillet
What is an insulator?
Substances that do not conduct thermal energy very well.
What is convection?
The transfer of energy by the movement (Circulation) of a liquid or a gas.
What is radiation?
The transfer of thermal energy through matter or space as waves. (The Sun!)
What is thermal conductivity?
The rate at which a substance conducts thermal energy.
What is a heat engine?
A machine that uses heat to do work. (2 types)
What is an external combustion engine?
To burn fuel outside the engine.
External combustion engine example?
Steam engine.
What is an internal combustion engine?
To burn fuel inside the engine.
Internal combustion engine example?
Car engine.
What is a heat pump?
Moves energy to increase or decrease the temperature.
What is a heat pump used for cooling?
Energy is taken from the air inside the house and the energy is pumped outside (A.C.) (Inside to outside)
What is a heat pump used for heating?
Energy is taken from the air outside the house and the energy is pumped inside. (A Heater) (outside to inside)
