Heat Vs. Thermal Energy
This is the total energy of all moving particles in an object.
Thermal Energy
Conduction is the transfer of thermal energy when two substances at different temperatures do this.
Touch
Convection only occurs in liquids and these.
Liquids and Gases
Radiation transfers thermal energy through these types of waves.
Electromagnetic Waves
Heat always flows from warmer objects to objects that are this.
Cooler
Thermal energy that is moving from one place to another is called this.
Heat
Conduction works especially well in solids because their particles are packed this way.
Tightly together/close together
In convection, warm fluids rise because they become less of this property.
Density ("weight")
Unlike conduction and convection, radiation does not require particles to do this.
Touch or Make contact
Heat always flows from warmer objects to objects that are this.
Same Temperature
True or False: A cold ice cube has no thermal energy because it feels cold to the touch.
False: (The ice cube still has thermal energy because its particles are moving, just more slowly than warmer objects.)
When a metal pan sits on a hot stove burner, energy transfers from the burner to the pan through collisions between these.
Particles
When water at the bottom of a pot heats up, it rises to the top and cooler water sinks down, creating this type of pattern.
When you feel warmth on your skin while standing near a campfire, this specific type of electromagnetic wave is transferring energy to you.
Radiation
On a hot summer day, you open your front door and warm air flows inside. Explain why the air moves from outside to inside using the rule of heat flow.
The outside air has more thermal energy than the inside air, so heat flows from the warmer outside to the cooler inside until the temperatures become equal.
When you touch a hot steering wheel on a sunny day, this is what is actually transferring from the wheel to your hand, not something the wheel was "storing."
Heat (thermal energy in motion)
You place a wooden spoon and a metal spoon in a pot of boiling water. Explain which spoon handle will feel hotter after one minute and why.
Metal Spoon
Ocean currents move warm water from the equator toward the poles and cold water from the poles toward the equator. Explain how this is an example of convection on a large scale.
Answers Vary: Warm water near the equator becomes less dense and rises/moves toward the poles, while cooler, denser water from the poles sinks and moves toward the equator, creating a continuous convection cycle in the ocean.
If someone stands between you and a campfire, you feel less heat. Explain what happens to the infrared radiation that causes this.
Answers Vary: The person's body absorbs and reflects some of the infrared waves, so less radiation reaches you and you feel less heat.
You place a room-temperature spoon into a cup of hot coffee. Describe the direction of heat flow and what happens to the temperature of both objects over time.
Answers Vary: Heat flows from the hot coffee to the cooler spoon. The coffee's temperature decreases while the spoon's temperature increases until both reach the same temperature
Explain why a metal chair sitting in a cold room still has thermal energy even though no heat is being transferred
Cold items still have particles that vibrate/ move (
The particles in the chair are still vibrating and moving, so it has thermal energy. Heat only exists when energy transfers between objects at different temperatures, so if nothing is touching the chair or transferring energy, there is no heat flow—but thermal energy is still present.)
A student claims that when you hold an ice cube, coldness transfers from the ice to your hand. Explain what is actually happening using the concept of conduction.
Answers Vary:
Heat (thermal energy) transfers from your warmer hand to the cooler ice cube through direct contact. There is no such thing as "coldness" transferring—only heat moving from hot to cold.
A student says convection happens in solids because heat spreads through a metal rod when one end is heated. Identify the error in this reasoning and explain the correct heat transfer method
Convection requires particles to move freely and carry energy with them, which cannot happen in solids where particles are fixed in place. The heat spreading through the metal rod is conduction, not convection, because energy transfers through particle collisions, not particle movement.
A student argues that the Sun heats Earth through convection because warm air rises in the atmosphere. Explain why the Sun actually heats Earth through radiation, not convection.
Answers Vary: The space between the Sun and Earth is a vacuum with no particles, so convection (which requires moving fluids) cannot occur. The Sun's energy travels through empty space as electromagnetic radiation until it reaches Earth's atmosphere and surface.
A student insists that when you put ice in a drink, the ice makes the drink cold by transferring coldness to it. Use the rule of heat flow to correct this misconception and explain what actually happens
Answers Vary: "Coldness" does not transfer—only heat does. Heat flows from the warmer drink to the colder ice. As the drink loses thermal energy, its temperature drops and it feels cold. The ice gains thermal energy and melts. The drink doesn't get cold because the ice gives it coldness; it gets cold because heat leaves the drink and enters the ice.