What is heat?
How does heat travel?
What is thermal conductivity?
Random
100
A measurement of the average kinetic energy of particles in an object is....
temperature
100
What type of heat transfer is given off when we feel heat from a space heater?
radiation
100
A material that conducts heat easily is a good _______________________.
thermal conductor
100
Why do we use oven mitts or potholders to protect ourselves from hot pans/pots?
They are good insulators!
200
Heat travels from....
hot to cold
200
What is energy that is spread through touching? (when two solids are in contact)
conduction
200
A material that conducts heat poorly is a good ___________________.
thermal insulator
200
Why are pots made of metal?
They are good conductors!
300
What is heat measured in?
Joules
300
What is the transfer of energy through waves called?
radiation
300
A lower heat capacity means a material...
changes temperature quickly
300
When does heat stop flowing between two objects?
When they reach equilibrium (same temperature)
400
What is heat?
heat is thermal energy that flows between objects - it is the amount of thermal energy that an object releases
400
Describe the process of convection
In gases and liquids, hot parts rise and cool parts sink.
This is because when there is more heat, particles move faster and spread out more. When particles are more spread out, density is lower and less dense substances rise.
400
What determines a material's heat capacity?
The way that particles are held together
400
Name all the types of heat transfer occuring in a pot of water boiling on the stove
conduction - since the pot is touching the stove and heat is traveling through contact
convection - the water is moving inside the pot
500
How does friction cause heat?
When objects are rubbed together, particles from each object bump into each other causing them to vibrate a little more. Higher vibrations mean more heat.
500
Why are infrared rays called infrared rays?
Because they are close to red visibile light.
500
Which is the slowest type of heat transfer and why?
Conduction, because energy is transferred by bumping into particles and so it has to bump into all the particles. This process takes time.
500
Why is water used to cool down hot machinery?
Water has a low heat capactiy - it does not get as warm as materials with a high heat capacity. Heat transfers from the hot machinery to the water, therefore cooling down the machine but without warming up the water as much as something like oil.