Name thermal-transfer mechanisms

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: A metal spoon warms in still soup while circulating soup carries warmth elsewhere. Distinguish the pathways.
• Assessment case 1: A metal rod warms farther from a hot end while the rod remains stationary. Which mechanism predicts this? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Warm fluid rises and cooler fluid replaces it.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Sunlight transfers energy through space.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Foam reduces heat-transfer rate.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Neighboring particles transfer energy through a solid.
• Assessment case 6: Energy from a warm surface reaches a detector across an ideal vacuum gap. What follows? Which inference or prediction is best supported?

Learn the idea

Conduction occurs through microscopic interactions, convection through bulk fluid motion and radiation through electromagnetic waves. These mechanisms can act together; radiation does not require matter between source and receiver.

Conduction means transfer through microscopic material interactions. Convection means transfer with bulk fluid movement. Radiation means transfer by electromagnetic waves. Insulation means design reduces the rate of transfer.

For the supplied mechanism problem, A metal spoon warms in still soup while circulating soup carries warmth elsewhere. Distinguish the pathways. Microscopic interactions conduct energy along the spoon. Bulk fluid movement carries energy by convection in soup. Both can occur together; neither destroys energy.

1. Read the supplied problem and mark the structures, processes or quantities named: A metal spoon warms in still soup while circulating soup carries warmth elsewhere. Distinguish the pathways.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.

Take it further

New task: draw sunlight crossing vacuum, a metal handle warming, and circulating warm air. Expected labels: radiation, conduction and convection respectively; distinguish energy transport from matter moving across the entire route.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.