Key Terms
The transfer of heat by direct contact
Conduction
Hot magma deep within the Earth's mantle moves in a current due to what form of heat transfer?
Convection
What tool can we use to measure temperature? (think about what's used when a doctor takes your body temperature)
Thermometer
Why are cooking pans typically made of a type of metal?
The transfer of heat through the movement of a fluid (liquids and gases)
Convection
What heat transfer is boiling water an example of?
Convection
What two phase changes can occur when water is at 0 degrees Celcius?
Melting and freezing
What state of matter has a fixed volume, takes the shape of its container, and has molecules that can move past one another?
Liquid
The unit of measurement for temperature
Celcius
We feel warmth when we sit next to a fire because the heat travels through waves. This is called ___________.
radiation
We wear woolen clothes and puffy jackets in winter because they are good thermal ___________.
insulators
True or False: An increase in kinetic energy will result in an increase in temperature.
True
_______ is the transfer of thermal energy from warmer to cooler objects
Heat
A current in a fluid that moves heat around is called what?
Example: The warm air from a heater rises, cools down, then sinks back down to the floor
Convection current
If two cubes at the same temperature are brought together, is heat being transferred?
No, if two cubes are at the exact same temperature and brought into contact, there is no net heat transfer because they are already in thermal equilibrium.
Which of the following best describes thermal energy?
a. The energy an object has due to its position
b. The total energy of all the particles in an object
c. The energy from the sun
B
The average kinetic energy of molecules in a substance
Temperature
All heat transfer ultimately aims to meet thermal ____________ (a balanced state in which a system is stable, such as when two or more samples are at the same temperature).
equilibrium
When reading a phase change diagram, what sections of the graph represent a phase change?
When the graph is horizontal (showing no change in temperature)
Why does heat rise?
Heat rises because the molecules move around and spread out, making it less dense.