Thermodynamics: Radiant Heat
Experience may tell you that dark-colored objects absorb radiant heat more quickly than light-colored objects. But is the reverse true?
Do dark-colored objects emit radiant heat more quickly than light colored objects? Determine the relationship between the color of an object and the rate at which it emits energy.
Lab Summary
Students will use Temperature Sensors to determine if there is a relationship between a container's color and the rate at which it loses energy due to radiation.
To accomplish this they will use two temperature sensors to measure and compare the change in temperature of equal amounts of hot water stored in two metal containers (one black and one unpainted) as the water cools over a 15-minute period. By determining which container transfers energy to its environment the quickest, they will draw conclusions about how the color of the container affects the rate of energy transfer.
Downloads
- Download Free Lab, (PDF, 528 KB) (524 KB, .pdf)
(student versions)
- Xplorer GLX-based lab, (PDF, 2.2 MB) (2.21 MB, .pdf)
Method
Use Temperature Probes to measure the change of temperature of initially hot water as equal quantities of the water cool in two similar aluminum cans.
Here's What You Need
U.S. Educator prices shown.
Required for computer-based lab: (See lab download for Xplorer GLX-based lab requirements, which may differ)
Probeware
PASPORT Temperature Sensor (PS-2125) - $30
Durable stainless steel temperature sensor with a wide measurable range. For use with PASPORT Interfaces.
Xplorer GLX (PS-2002) - $349
The Xplorer GLX is a data collection, graphing, and analysis tool designed for science students and educators.
Other Products
Radiation Cans (TD-8570A) - $28
Three cans in different colors to quantitatively investigating a full range of heat transfer phenomena.
Hot Plate (SE-8830) - $159
This compact and durable hot plate can reach up to 400 °C in minutes. The cast aluminum top plate provides an even heating surface, and it even has a built in support rod holder.
Other Materials
- Beaker, 1-L
- Tongs (for handling hot cans)
- Thermal Insulation Pad (Pot Holders)
- Graduated Cylinder, 50-mL
- Protective Gear
- Hot Water (~ 90°)
Lab Manual
The Xplorer GLX-based lab is included in Physics with the Xplorer GLX
(PS-2826). The computer-based activity is included in Explorations in Physics
(PS-2810). Both manuals are complete with Teacher Information pages, student
instructions and handouts, and sample data.
For your convenience, we
offer bundles which provide the probeware for the activities in the manual. For
more, please see:
Xplorer GLX-based Physics Lab Manual and Bundles
Computer-based Physics Lab Manual and Bundles
