Chất Lỏng Phi Newton: Oobleck

Tạo chất lỏng đặc khi chịu lực cắt từ bột ngô và nước

Classroom Demonstrations Beginner (Middle School) 20 phút ~$3,00

Mục tiêu

Tạo và khám phá chất lỏng phi Newton vừa có tính chất rắn vừa có tính chất lỏng tùy thuộc vào lực tác dụng.

Bối cảnh

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.'

Cảnh báo an toàn

  • 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

Vật liệu

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

Thiết bị

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

Quy trình

1

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

2 phút
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 phút
3

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

3 phút
4

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

3 phút
5

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

3 phút
6

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

4 phút Protect the speaker with plastic wrap

Kết quả dự kiến

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.

Dọn dẹp

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

Chi tiết

Danh mục
Classroom Demonstrations
Độ khó
Beginner (Middle School)
Thời gian
20 phút
Chi phí ước tính
$3,00
Số bước
6
Vật liệu
3

Thí nghiệm khác

Cốc Thủy Tinh Biến Mất (Khớp Chiết Suất) 15 min Cột Cầu Vồng Mật Độ 30 min Đóng Băng Tức Thì: Nước Siêu Lạnh 120 min Kem Đánh Răng Voi 20 min Magie Cháy Trong Băng Khô 25 min Phản Ứng Dao Động Briggs-Rauscher 40 min Phản Ứng Đồng Hồ Iot 45 min Phản Ứng Natri với Nước 25 min Phản Ứng Thermit 30 min Phát Quang Hóa Học với Luminol 30 min

Frequently Asked Questions

What is the objective of Chất Lỏng Phi Newton: Oobleck?
Tạo và khám phá chất lỏng phi Newton vừa có tính chất rắn vừa có tính chất lỏng tùy thuộc vào lực tác dụng.
How difficult is Chất Lỏng Phi Newton: Oobleck?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Chất Lỏng Phi Newton: Oobleck?
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 Chất Lỏng Phi Newton: Oobleck?
The main materials required are: Cornstarch, Water, Food coloring.
What results should I expect from Chất Lỏng Phi Newton: Oobleck?
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.