Radiation and Heat Transfer: Comparing Surface Color and Material Effects on Radiant Heat Absorption
Science Lab · Grade 7
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Type
science_lab
Pre Lab
Background: Have you ever noticed that a black car parked in the sun feels much hotter than a white car parked in the same spot? This is not a coincidence — it is science! Energy from the sun travels through space and reaches Earth in the form of **radiation**. **Radiation** is the transfer of energy through electromagnetic waves and is the only form of **heat transfer** that does not require matter to move energy from one place to another. Unlike **conduction**, which transfers heat through direct contact between objects, or **convection**, which transfers heat through the movement of fluids like air and water, radiation can travel through the vacuum of space.
When radiant energy from a heat source (like the sun or a lamp) strikes a surface, some of that energy is absorbed and some is reflected. Dark-colored surfaces, especially black ones, tend to absorb more radiant energy and reflect less. Light-colored surfaces, especially white ones, tend to reflect more radiant energy and absorb less. This is why wearing dark clothing on a sunny day makes you feel warmer than wearing light clothing. The absorbed radiant energy causes the particles in the material to move faster, which we measure as an increase in **temperature**.
In this investigation, you will use a heat lamp to shine radiant energy onto containers covered with different colored materials. You will measure the **temperature** inside each container over time to determine how surface color affects radiant heat absorption. As you conduct this experiment, think carefully about your **independent variable** (what you change), your **dependent variable** (what you measure), and your **controlled variables** (what you keep the same) to make sure your results are valid and reliable.
Vocabulary
Term: radiation
Definition: The transfer of energy through electromagnetic waves; does not require matter and can travel through the vacuum of space.
Term: heat transfer
Lab Type
Post Lab
Standards
Safety Level
Teacher Notes
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Experiment Design
Research Question
Learning Objectives
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