非ニュートン流体：ウブレック

トウモロコシデンプンと水でずり増粘流体を作る

Classroom Demonstrations Beginner (Middle School) 20 分 ~$3.00

目的

加えた力によって固体にも液体にも振る舞う非ニュートン流体を作成・探究する。

背景

Oobleck is a suspension of cornstarch in water that exhibits shear-thickening (dilatant) behavior. Under slow, gentle force, it flows like a liquid. Under sudden, strong force, the starch particles jam together and it behaves like a solid. This non-Newtonian behavior occurs because the starch particles are suspended at a critical concentration where they can rearrange under slow stress but lock together under rapid stress. The name comes from the Dr. Seuss book 'Bartholomew and the Oobleck.'

安全上の警告

  • Cornstarch is slippery when wet — clean up spills immediately
  • Do not pour oobleck down the drain — it will clog pipes
  • Non-toxic but not for consumption

材料

  • Cornstarch (400 g)
    About 2 cups
  • Water (250 mL)
    About 1 cup
  • Food coloring (5 drops)
    Optional

器具

Large mixing bowl Spoon Plastic sheet or tray (to contain mess) Speaker with subwoofer (optional, for vibration demo)

手順

1

Place the mixing bowl on the plastic sheet. Add the cornstarch to the bowl.

2 分
2

Slowly add water while mixing with your hands. The ideal ratio is about 1.5–2 parts cornstarch to 1 part water. Add water gradually until the mixture is the consistency of thick honey.

5 分
3

Test 1 (Slow force): Gently dip your hand in and slowly pull it out. The oobleck flows like a liquid.

3 分
4

Test 2 (Fast force): Punch the surface hard. Your fist bounces off as if hitting a solid.

3 分
5

Test 3 (Shaping): Squeeze a handful quickly into a ball. When you stop squeezing, it melts back into liquid.

3 分
6

Optional: Place the bowl on a speaker playing low-frequency bass. The oobleck forms standing wave patterns and finger-like protrusions.

4 分 Protect the speaker with plastic wrap

予想される結果

The oobleck flows under gentle handling but solidifies under impact. It can be rolled into a ball that melts in your palm. On a vibrating speaker, it forms dramatic standing wave patterns.

後片付け

Let oobleck dry and scrape off surfaces. Do NOT wash down drains. Dispose of dried oobleck in trash. Wipe surfaces with damp cloth.

詳細

カテゴリ
Classroom Demonstrations
難易度
Beginner (Middle School)
所要時間
20 分
推定費用
$3.00
ステップ数
6
材料
3

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Frequently Asked Questions

What is the objective of 非ニュートン流体：ウブレック?
加えた力によって固体にも液体にも振る舞う非ニュートン流体を作成・探究する。
How difficult is 非ニュートン流体：ウブレック?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for 非ニュートン流体：ウブレック?
Key safety precautions include: Cornstarch is slippery when wet — clean up spills immediately; Do not pour oobleck down the drain — it will clog pipes; Non-toxic but not for consumption.
What materials are needed for 非ニュートン流体：ウブレック?
The main materials required are: Cornstarch, Water, Food coloring.
What results should I expect from 非ニュートン流体：ウブレック?
The oobleck flows under gentle handling but solidifies under impact. It can be rolled into a ball that melts in your palm. On a vibrating speaker, it forms dramatic standing wave patterns.