Suited for Spacewalking pdf - Virtual Astronaut

InvestigationWater Cooling—Part OneSiphon from icewater bucketThis demonstration shows the principle behind theoperation of the Space Shuttle EMU liquid coolinggarment.Instead of an internal heat source (the suitwearer), the heat is provided by a strong electriclight bulb or flood lamp.Materials and Tools ChecklistTwo coffee cans with plastic lids4 meters of aquarium tubingTwo bucketsTwo thermometersDuct tapeWater (solid and liquid)Heat source (light bulb and fixture)Hole punchFlood light and fixtureProcedureStep 1. Punch a hole near the bottom of the wall of ametal coffee can. The hole should be largeenough to pass aquarium tubing through.Punch a second hole in the plastic lid ofthe canso that tubing can pass through it as well.Punch another hole in the center of the lid sothat a thermometer will fit snugly into it.Finally, punch a hole in the center of the sec -ond coffee can lid for another thermometer.Step 2. Loosely coil the aquarium tubing and place itinside the first coffee can. Use bits of tape tohold the coils to the walls and to keep themspread out evenly. Pass the lower end of thetube through the hole in the can wall and theupper end through the outer hole in the lid.The lower tube should extend to the catchbucket that will be placed below the can.Theupper end will have to reach to the bottom ofthe ice water bucket.That bucket will be ele -vated above the can.Insert thermometers intoeach can.Step 3.Step 4.Step 5.Step 6.Water flow tocatch basinPlace the two cans on a table top. Direct thelight from a strong light bulb or flood light tofall equally fall on the two cans. The lightshould be no more than about 25 centimetersaway from the cans. Fill a bucket with icewater and elevate it above the two cans.Placethe catch bucket below the two cans.Turn on the light. Observe and record thetemperatures on the two thermometers. Aftertwo minutes, again observe and record thetemperatures.Place the upper end of the aquarium tubinginto the ice water and suck on the other end ofthe tube to start a siphon flowing. Let thewater pour into the catch bucket.Observe and record the temperature ofthe twocans at regular intervals for ten minutes.Tips• If more than one student is going to start thesiphons with sucking on the end of the tube,make sanitary mouthpieces like those called forin the activity "O 2 How Much?"• Color the water with food coloring to increase itsvisibility in the siphons.7 2 • Suited for Spacewalking An Activity Guide for Technology Education, Mathematics, and Science, EG- 1 9 9 8 - 0 3 - 1 1 2 - H Q