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25 terms

Thermal Energy, Heat, Temperature and Heat Transfer

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Absolute Zero
No more energy can be removed from matter at this point.
Heat is measured in.....
joules
Conduction
The process when heat is transferred from one particle to another with direct contact.
Radiation
The process when energy is transferred by electromagnetic/radiant waves.
Insulator
A material that DOES NOT conduct heat well.
Water's freezing point
32 degrees Fahrenheit
Temperature
A measure of the average kinetic energy of the individual particles in an object.
Heated air moves from baseboard heaters to the rest of a room (heating a house)
An example of Convection
An example of radiation
Warming up beside a campfire
The type of energy that moving particles have
Kinetic energy
Why alcohol in a thermometer rises
thermal expansion
Sun transferring thermal energy
An example of radiation
If two glasses of water are at the same temperature,
the average KINETIC energy of the particles of water in each glass is the same.
When THERMAL energy is transferred from one object to another...
the temperature of the object giving off heat decreases
How does a thermometer work?
A liquid, often mercury or alcohol, is sealed in a long, thin glass tube. As the liquid is heated, the particles speed up and spread out. When the particles spread out, the liquid takes up more volume, and so it expands and rises in the tube. When the liquid cools, the particles come closer together, causing the liqid to contract and flow down the tube.
The reason that placing a jar under warm running water helps to loosen the lid on the jar?
Thermal expansion
How do you change the temperature on the Kelvin scale to Celcius?
Subtract 273
The more particles a substance has at a given temperature...
the more thermal energy it has
Heat transfer occurs
only from warm objects to colder ones
An example of a good conductor
silver
If two substances have the same temperature
the substances have the same average kinetic energy
An example of conduction
The handle of a spoon in a bowl of soup becomes warm due to heat transfer
An example of conduction
When one end of an iron nail is held in a flame, the energy is transmitted along the nail
An example of an external combustion engine
A steam engine
An example of an internal combustion engine
The engine in a car