Competency 2 - Heat Transfer Flashcards
How does heat energy differ from:
Chemical Energy?
Chemical bonds that hold molecules together are released when they undergo a chemical change.
What is heat energy?
The motion of atoms.
How does heat energy differ from:
Electrical Energy?
Electrical energy is the flow of electrons.
How does heat energy differ from:
Electromagnetic Energy?
Electromagnetic energy is the movement of electrons, and is energy that can travel through nothing.
How does heat energy differ from:
Mechanical Energy?
Mechanical energy is the combination of
kinetic energy & potential energy.
How does heat energy differ from:
Nuclear Energy?
Nuclear energy is when an atom changes its identity and releases energy.
What is the difference between heat and temperature?
Heat is just atoms moving really fast. Temperature is a measure to the average of all this movement.
(Average speed of all particles = Temperature)
Use the kinetic molecular theory to explain how we know there is no such thing as cold.
Kinetic molecular theory = atoms are always in motion.
If these atoms aren’t moving so fast, there is less heat, making it “colder.”
Cold is a “myth.” Yea.
Explain how heat flows and what thermal equilibrium is.
Heat flows from a higher temperature to a lower temperature. Eventually, the atoms will start bumping into each other, making them “jiggle” into an equal temperature.
Celsius and Kelvin:
Identify absolute zero on both scales.
Celsius: -273.15 degrees C
Kelvin: 0 K
Celsius and Kelvin:
How do you convert one to the other?
If you have 100 K, but want to convert to Celsius, you SUBTRACT -273.15.
OR
If you have 100 C, but want to convert to Kelvin, then you ADD 273.15.
Celsius and Kelvin:
What is the purpose of each?
Kelvin:
Is based off of the motion of atoms; is designed so that absolute zero is at 0 K.
Celsius:
Is based off of water.
What is absolute zero?
“Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance.”
