ペットボトル簡易気圧計の教材開発とその教材を利用した気象観測実習  [in Japanese] Development of a Simple PET (plyethylene terephthalate) Bottle Barometer and Meteorological Observation  [in Japanese]

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Author(s)

Abstract

本論はペットボトル簡易気圧計を用いた気象観測実習の新しい方法を提案した.階段を上り下りすることにより,ペットボトルに剌したストロー内の水面の変化から気圧の変化を読み取る実習である。気圧が減少/増大するとストロー内の水面は上昇/下降する。校舎の各階で気圧を観測した結果,各々の階と1階の気圧差には比例の関係があり,4階と1階には1 hPa以上の気圧差が認められた。階を上り下りする際に生じる気圧の変化量でも,水面の変化は十分読み取ることができた。気温の変化がなく,1 hPaの気圧の変化があったときの水面の変化について理論的に考察を行ったところ,ストローの半径が小さいほど,ペットボトルに入っている空気の体積が大きいほど,ペットボトルに入れる液体の密度が小さいほど水面の変位は大きくなることが分かった。エレベーターによって1階と4階を移動する実験でもおおむね同様な結果が得られた。この簡易気圧計を用いた授業を琉球大学教育学部附属中学校において実施した結果,多くの生徒が水面の変化を確認できたこと,この教具は役立ち実習が楽しいと感じたこと,そしてこの実習は天気の学習に意欲を高めることなどが分かった。

This study presents a new method of meteorological observation using a simple barometer made by inserting a straw into the cap of a PET bottle. The change in air pressure can be read by the shift of the water level in the straw. When the atmospheric pressure decreases/increases, the water level in the straw ascends/descends. The shift of the water level in the PET bottle is slight in comparison with that in the straw. First of all, we observed the air pressure on each floor of school buildings. The results showed that the pressure differed on each floor, that the level was in proportion to the number of the floor, and that the average of pressure difference between the 4th and 1st floors was over IhPa. Thus the change of air pressure can be easily seen in climbing/descending the stairs. The shift in the water level was theoretically discussed under an air pressure increase of IhPa and no change of temperature. The results showed that the shift became visibly larger because of the small diameter of a straw tube, the large volume of air in the PET bottle, and the low density of liquid. We also conducted the experiment by using an elevator. These results agreed with the theoretical results roughly. This method of meteorological observation with a simple PET bottle barometer has been planned for use in a lower secondary school. The result in the trial lesson showed that many students observed the shift of the water level, that many students felt this activity interesting and this teaching material useful, and that this activity encouraged students to study the weather.

Journal

  • Journal of research in science education

    Journal of research in science education 48(2), 35-44, 2007-11-30

    Society of Japan Science Teaching

References:  12

Codes

  • NII Article ID (NAID)
    110006884615
  • NII NACSIS-CAT ID (NCID)
    AA11406090
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    13452614
  • NDL Article ID
    9345264
  • NDL Source Classification
    ZF9(教育--各科教育)
  • NDL Call No.
    Z7-1282
  • Data Source
    CJP  NDL  NII-ELS 
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