Suited for Spacewalking pdf - Virtual Astronaut

9. Vacuum Experiment - 1Obtain an electric doorbell,push button, and doorbelltransformer. Insert the wires to the doorbellthrough a single-hole rubber stopper. The stoppershould fit the upper hole in the bell jar. Fill the restof the stopper hole with hot glue from a hot-gluegun to seal the wires in place. Evacuate the bell jarand ring the doorbell. While holding the button,gradually let air back into the jar. The bell cannot beh e a rd ringing when the jar is evacuated eve nthough the clapper can be seen to be moving. Thisdemonstration explains why spacesuits have 2-wayradios. Sound is not conducted through a vacuum.11. Vacuum Experiment - 3C on s t ruct a marshmall ow astronaut out of re g u-lar size and mini marshmall ows and toothpick s .Evacuate the bell jar and observe how the marshma ll ows expand. Living tissue will also inflate ina vacuum because of gas bubbles forming in thefluids of cell s .To TransformerPushButtonDoorbellNote: The vacuum pump, vacuum plate, and bell jarneeded for the activities on this page are common piecesof science equipment found in many junior and seniorhigh schools. This equipment is available from schoolscience supply catalogs.10. Vacuum Experiment - 2Show how fluids like water boil when they areexposed to a vacuum. Place water in a beaker andevacuate the bell jar. The demonstration will takeplace more rapidly if warm water is used. Place athermometer in the beaker to record the boilingtemperature.12.Underwater TrainingIf a swimming pool is available, practice underwaterEVA training. Have students wear a dive mask9 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