Cột Cầu Vồng Mật Độ

Xếp lớp các chất lỏng mật độ khác nhau tạo cột màu sắc

Classroom Demonstrations Beginner (Middle School) 30 phút ~$8,00

Mục tiêu

Minh họa khái niệm mật độ chất lỏng bằng cách xếp các chất lỏng không tan lẫn với mật độ khác nhau thành cột cao.

Bối cảnh

Different liquids have different densities, and immiscible liquids will arrange themselves with the densest at the bottom and the least dense at the top. By carefully layering liquids such as honey, corn syrup, dish soap, water, vegetable oil, and rubbing alcohol, a dramatic rainbow column can be created. Small solid objects placed in the column float at the interface matching their density, further illustrating the concept.

Cảnh báo an toàn

  • Rubbing alcohol is flammable — no open flames
  • Some liquids are sticky — clean spills immediately
  • Do not drink any of the layered liquids

PPE cần thiết

goggles

Vật liệu

  • Honey (50 mL)
    Density ≈ 1.42 g/mL
  • Corn syrup (50 mL)
    Density ≈ 1.38 g/mL
  • Maple syrup (50 mL)
    Density ≈ 1.32 g/mL
  • Dish soap (50 mL)
    Density ≈ 1.06 g/mL
  • Water (dyed blue) (50 mL)
    Density = 1.00 g/mL
  • Vegetable oil (50 mL)
    Density ≈ 0.92 g/mL
  • Rubbing alcohol (dyed red) (50 mL)
    Density ≈ 0.79 g/mL
  • Food coloring (Various)
    To distinguish water and alcohol layers

Thiết bị

Tall clear glass or graduated cylinder (500 mL) Funnel or turkey baster Small objects: grape, cherry tomato, ping pong ball, bolt, cork

Quy trình

1

Start with the densest liquid: pour honey slowly into the bottom of the tall glass.

2 phút
2

Tilt the glass slightly and pour corn syrup slowly down the side. It should form a distinct layer on top of the honey.

3 phút
3

Continue adding layers in order of decreasing density: maple syrup, dish soap, blue-dyed water, vegetable oil, and red-dyed rubbing alcohol.

15 phút Pour very slowly for clean layers
4

Observe the distinct layers. Gently drop small objects (grape, bolt, cork, ping pong ball) into the column and note where they settle.

5 phút
5

Discuss why the layers form (density differences), why some are miscible and some immiscible, and why objects float at specific levels.

5 phút

Kết quả dự kiến

Seven distinct layers should be visible, creating a colorful rainbow column. A metal bolt sinks to the bottom, a grape rests on the corn syrup, a cherry tomato on the dish soap, and a ping pong ball floats on top. Cork floats on the water layer.

Dọn dẹp

Pour the column into a waste container (do not pour down the drain due to oil and syrup). Wash the glass with hot soapy water.

Chi tiết

Danh mục
Classroom Demonstrations
Độ khó
Beginner (Middle School)
Thời gian
30 phút
Chi phí ước tính
$8,00
Số bước
5
Vật liệu
8

Thí nghiệm khác

Chất Lỏng Phi Newton: Oobleck 20 min Cốc Thủy Tinh Biến Mất (Khớp Chiết Suất) 15 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 Cột Cầu Vồng Mật Độ?
Minh họa khái niệm mật độ chất lỏng bằng cách xếp các chất lỏng không tan lẫn với mật độ khác nhau thành cột cao.
How difficult is Cột Cầu Vồng Mật Độ?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Cột Cầu Vồng Mật Độ?
Key safety precautions include: Rubbing alcohol is flammable — no open flames; Some liquids are sticky — clean spills immediately; Do not drink any of the layered liquids.
What materials are needed for Cột Cầu Vồng Mật Độ?
The main materials required are: Honey, Corn syrup, Maple syrup, Dish soap, Water (dyed blue).
What results should I expect from Cột Cầu Vồng Mật Độ?
Seven distinct layers should be visible, creating a colorful rainbow column. A metal bolt sinks to the bottom, a grape rests on the corn syrup, a cherry tomato on the dish soap, and a ping pong ball floats on top. Cork floats on the water layer.