CHALLENGER'S LOST LESSONS - ER - NASA

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88[Christa reaches for a container representing one of the lexan bottles.It topples onto the floor of the mock-up mid-deck. Her commentshows her wonderful sense of humor, “Whoops…this zero gravityenvironment is just awful!”]Two of these containers will be used. One has 1/2 water and1/2 oil. The other contains 1/3 water, 1/3 oil, and 1/3 air. These canbe compared to determine how the presence of the air affects the waythe liquids behave. A marble is in each bottle to stir the mixture.Also, the teacher [Christa] will use a large quartz crystal to discussthe special conditions conducive to the growth of large crystals,especially relating to the growth of crystals in space. “
89A Classroom Version of Christa’s“Where We’ve Been and Where We’re Going, Why?”Lost LessonThe following demonstration replicates Christa’s planned live lessonexperiment:Principles:The crux of the second live lesson is fluid behavior in zero-g.The focus deals with fluid mixing behavior as well as settlingbehavior. An important facet of the demonstration is comparingthese actions with earth-based techniques under the influence ofgravity. While a qualitative demonstration is not complicated, thescientific explanations dealing with surface tension and othermolecular forces are quite involved, perhaps, to a greater extent thanthe six filmed lessons. However, the discussion of differencesbetween gravity forming and mixing phenomena versus zero-gresults is useful. For example, the dropping of a raindrop earthwardwould be in “free-fall”, i.e., in zero-g, but the added effect, friction,of air molecules contacting the falling drop would distort itsspherical form. Such would not be the case aboard Challenger. Nogravity would cause a drop of liquid to speed through the cabinatmosphere. These kinds of qualitative considerations would be abenefit of the live lesson mixing and liquid formationdemonstrations.A principle which earth based fluids obey is “buoyancy”, theseparation of fluids by virtue of their density or “weight per unitvolume” which cause lighter fluids to float on top of denser heavierliquids. Of course, without gravity, buoyancy is absent. In such anenvironment fluids of varying densities might be expected to mixmore readily such that the resulting liquid is a uniform compositemixture. Earth based mixing depends on the physical shaking of themulti-fluid mixture to assume a uniform composition temporarilyuntil the effects of buoyancy slowly separate the fluids once more.The use of gravity can be helpful in separate fluids of differing
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CHALLENGER’S LOST LESSONSProject
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9Hydroponics ChamberAnother aspect
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13of the mass of each other. This w
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19with an insert to provide frictio
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21Challenger’s Live Lost LessonsW
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25THE LOST HYDROPONICS CHAMBER LESS
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27Hold down CTRL Key and click here
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29i.e., the leaves may simply droop
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31After each daily spraying of the
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332. What impact would ambient ligh
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35Christa Practicing Bar Magnet in
Page 37 and 38: 37Observe the movement of the right
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Page 45 and 46: 45the final lines of force pattern.
Page 47 and 48: 47permanent magnet.)The assembly of
Page 49 and 50: 49THE LOST NEWTON’S LAWS LESSON
Page 51 and 52: 51Such an experiment reminds educat
Page 53 and 54: 53equal for both projectiles. Cups
Page 55 and 56: 55Process:Cutaway view of spring re
Page 57 and 58: 57Questions to Answer:1. What did y
Page 59 and 60: 59THE LOST EFFERVESCENCE LESSONThe
Page 61 and 62: 61dioxide. The gas was contained in
Page 63 and 64: 63THE LOST CHROMATOGRAPHY LESSON“
Page 65 and 66: 65Hold down CTRL Key and click on:c
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Page 69 and 70: 69THE LOST SIMPLE MACHINES LESSONIn
Page 71 and 72: 71station actually has a trolley ty
Page 73 and 74: 733) A screwdriver and wood screws.
Page 75 and 76: 75*3. Hammer a nail lightly into th
Page 77 and 78: 77What Would Have Happened on Chall
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Page 81 and 82: 81The “The Ultimate Field Trip”
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Page 91 and 92: 91easily done in the KC-135 aircraf
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Page 95 and 96: 95Wright Brothers’ AirplaneIntern
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CHALLENGER'S LOST LESSONS - ER - NASA

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