ThermodynamicsLesson 3 of 3 in the course Temperature and Heat

Heat Transfer by Conduction, Convection, Radiation, and Combined Processes

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Heat is energy transferred because of a temperature difference. Heat is not a substance stored in an object; rather, it describes energy moving between systems. A larger temperature difference generally produces a faster rate of heat transfer, although the material and physical process also matter.

Heat transfer can occur quickly, as through a metal cooking pan, or slowly, as through the insulated walls of an ice chest. In everyday situations, multiple mechanisms often work together.

All flashcards

Thermal conductivity
A material property describing how readily heat flows through it by conduction.
Forced convection
Fluid-driven heat transfer in which an external device, such as a fan or pump, drives the flow.
Emissivity
A surface's effectiveness at emitting radiation compared with an ideal blackbody; its value ranges from 0 to 1.
Thermal resistance per unit area
For a uniform slab, the ratio of its thickness to its thermal conductivity.
Evaporative cooling
Cooling that occurs when evaporation takes latent heat from a surface.

Quiz questions

  1. What drives natural convection in a fluid heated from below?Answer: Buoyancy caused by density differences in the fluid.
  2. For equal-area layers in series at steady state, how is their total thermal resistance found?Answer: Add the thermal resistances of the individual layers.
  3. What does a surface's emissivity describe?Answer: How effectively it emits radiation compared with an ideal blackbody.
  4. How do greenhouse gases influence Earth's surface temperature?Answer: They absorb and re-emit some infrared radiation, affecting energy transfer.
  5. How can airflow help sweat cool the body in humid conditions?Answer: It replaces moist air near the skin with drier air, supporting evaporation.

Based on University Physics Volume 2 by Samuel J. Ling, William Moebs, Jeff Sanny (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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