Convection/Conduction/Radiation
What is conduction
The transfer of heat from one molecule to another through direct contact
What are the three main states of matter?
Solid, liquid and gas
How does heat travel from the sun to the earth?
Through radiation
What causes an object to change from one state of matter to another?
a change in temperature
Thermal energy is a measurement of the movement of an objects........
molecules
Radition is heat transfer through what?
Electromagnetic Waves
What state of matter has a definite shape and volume
Solid.....it keeps its own shape
What is the degree of hotness or coldness an object has
Its temperature
What is it called when a material changes from a solid to a liquid?
Melting
How is temperature connected to thermal energy?
Higher temperature means higher thermal energy
What happens to particles when they are heated
They begin to move faster and spread out
True or False: Molecules in a material can be completely still
False
What is the energy transferred between two substances of different temperatures
Heat
A decrease in thermal energy of a liquid would cause that liquid to.....
Freeze
What causes a cup of coffee to get cool sitting on a table?
The hot coffee transfers thermal energy to the surrounding air
Why does warm air rise?
Because the molecules spread out as they move faster, making the air less dense.
How are particles in a liquid different than those in a solid?
They are less packed together and flow around each other.
How do molecules transfer energy?
THe molecules bump into each other and transfer energy
What is it called when liquid turns into a gas?
Evaporation
When thinking about thermal energy, we talk about the movement of the molecules. What is the energy of movement called?
Kinetic energy
What happens to the density of water when it is heated?
It goes down, causing the water to rise
What makes the molecules in gases different than solids and liquids?
They have no definite shape and the molecules are moving freely from each other
Why does a double walled cup work so well at keeping temperature constant?
The space between the material doesnt allow molecules to bump into one another and transfer energy
What is the process in which gas turns into a liquid
Condensation
How can thermal energy be transferred without contact?
Through radiation