WOORDROW WILSON
                                                 Environmental Science Institute
                                                                 Rutgers, N.J.
                                                    Internet Committee Requests
                                                                 July 5, 1998

TITLE:   MEASURING  THERMAL ENERGY TRANSFER
NAME:  Madelyn Asperas
Email:     masperas@suffolk.lib.ny.us
KEY WORDS: Thermal energy quotient, specific heat, temperature, Celsius degrees, Joule, kinetic energy, heat flow,
                mass, density

RATIONALE: Global Warming involves a transfer of heat around the world and an increase of the world's temperature overall; NASA spacecraft and instruments need to be designed by thermal engineers for safe travel into planetary orbit and beyond; "spacecraft blankets" are built for long-term durability and high thermal requirements to keep the spacecraft at room temperature (ex. Cassini Project ~ NASA). This experiment is designed to show students the relevance of science investigations to "real-life" situations and give them a way to calculate and quantify heat transfer.

TEXT:   Different materials need different amounts of heat to produce similar changes in their temperatures. Materials have different specific heats. The specific heat of a material is the amount of energy it takes to raise the temperature of one kilogram of the material one degree Celsius. Specific heat is measured in joules per kilogram per degree Celsius (J/kg X degrees C). Jumping into a cold pool can take your breath away on a hot day because the water can take heat away from your body more quickly because its specific heat is much higher than that of the air.
 
             Specific heat can be used to measure changes in thermal energy by using the equation:
 
            Change in thermal energy =  mass  x  Change in temperature  x  specific heat
                                                 Q  =     m   x  delta T  x  C_p

MATERIALS: Calorimeter (bought or made from styrofoam cups with lid), metal samples like copper weight, lead sinker, and saved ball of aluminum from the students' lunches, thermometer in degrees C, cooking pot, boiling water, goggles, balance, graduated cylinder, hot plate, tongs

PROCEDURE: 1) BOIL WATER IN A POT ON A HOT PLATE
                           2) USE A BALANCE TO FIND THE MASS OF EACH SAMPLE & RECORD IN Kg
                           3) ADD SAMPLES OF COPPER, LEAD, & AN ALUMINUM BALL INTO THE BOILING
                               WATER
                           4) TWO TEAMS OF STUDENTS WILL TEST THE SAME SAMPLE
                           5) READ THE INITIAL TEMPERATURE ( T_i ) OF 200 ml OF WATER IN THE
                               CALORIMETER & RECORD
                           6) CAREFULLY PLACE THE HOT SAMPLE FROM THE BOILING POT INTO THE
                               CALORIMETER AND IMMEDIATELY RECORD TEMPERATURE CHANGES EVERY
                               FEW SECONDS UNTIL TEMPERATURE IS STABLE
                           7) RECORD THE FINAL TEMPERATURE IN THE  T_f  BOX
                           8) USE EQUATION  Q =  AND FIND THE CHANGE IN THERMAL ENERGY
                           9) LINE GRAPH YOUR RESULTS

SPECIFIC HEAT CHART: (needed information)
 

COMMON MATERIALS    SPECIFIC HEAT                                                     (J/kg x oC)
Water................................................ 4190	Iron............................................ 450
Alcohol.............................................. 2450	Copper....................................... 380
Aluminum............................................ 920	Silver......................................... 235
Carbon (graphite)............................... 710	Clay........................................... 130
Sand.................................................... 664

 
 
STUDENT  DATA CHART:
 

LAB GROUPS	FINAL TEMP ( Tf )	INITIAL TEMP ( Ti)	MASS (Kg)	SPECIFIC HEAT ( Cp )	Q = JOULES
1.
2.
3.
4.
5.
6.

 

STUDENT LAB CONCLUSIONS:

1._________________________________________________________________________________________

2._________________________________________________________________________________________

3._________________________________________________________________________________________
 

RESOURCES:
    Cassini Project ~ http://www.jpl.nasa.gov/cassini
    Sierra Club's Global Warming Campaign ~ http://www.toowarm.org/
    Individual Contribution to Global Warming ~ http://host.envirolink.org/edf/dosomething/whatcanwedo/
    National Oceanic and Atmospheric Administration ~ http://www.noaa.gov/

STANDARDS:
    Learning Standards for Mathematics, Science, and Technology at Three Levels
    Standards # 1, #2, #3, #4, #5, #6, & #7
 
 

Woodrow Wilson Leadership Program in Environmental Science lpt@www.woodrow.org
The Woodrow Wilson National Fellowship Foundation webmaster@woodrow.org
CN 5281, Princeton NJ 08543-5281 Tel:(609)452-7007 Fax:(609)452-0066