Temperature and Heat
What is the unit for Thermal Energy?
Joule
heat transfer by contact
Conduction
A wool sock is an example of this type of material
Insulator
When an object is heated, what happens to the molecules of that object?
The molecules speed up
What is the pattern of heat transfer?
hot to cold
What is heat?
Thermal Energy
Transfer of thermal energy through electromagnetic waves
Radiation
Metal is a good example of this
A conductor
How does your coat keep you warm?
A water bottle at 27 degrees Celsius is placed into a refrigerator at 3 degrees Celsius. What will be the temperature of the water bottle and the refrigerator once they reach thermal equilibrium?
15 degrees Celsius
What is Temperature?
Average kinetic energy of molecules/atoms
Heat transfer through currents
Convection
Boiling water
Convection
Is a styrofoam cup an insulator or a conductor? Why?
Insulator -- used to keep liquid warm
A 60 degree ball of iron is dropped into a bucket of 24 degree water. Once thermal equilibrium is reached, the ball and the water will have what temperature?
42 degrees
How do we measure heat AND what temperature scale do we use in the U.S?
Thermometer, Fahrenheit
What is the zeroth law of thermodynamics?
no heat is transferred between two objects in thermal equilibrium
Radiation
What happens when an object at a higher temperature touches an object with a colder temperature? Describe what happens to the molecules
Thermal energy moves from hot to cold. The molecules in the hotter object slow down and the molecules in the colder object speed up.
An ice cube melts on the table until reaching thermal equilibrium. How is the heat transferred in this situation?
table --> ice
Kinetic energy depends on both ____ and ______
Mass and Velocity
Heat moves from _____ temperatures to _____ temperatures
Hotter temperatures to cooler temperatures
A metal plate melting an ice cube
Conduction
What is thermal equilibrium?
When two objects reach the same temperature
A heated ball of lead was dropped into a bucket of water that was 23 degrees. After reaching thermal equilibrium, the water was 45 degrees. How hot was the ball of lead before it was dropped in the water?
67 degrees