Matter, Density & Buoyancy
Welcome to your interactive study guide. Explore the relationship between mass and volume, visualize why objects float or sink, and master the calculations required for Grade 9 Science.
Use the tools below to experiment, then test your knowledge in the Practice Arena.
📦 Density Visualizer
**Core Concept:** Density describes how "tightly packed" particles are. Change the **Mass** (number of particles) or **Volume** (box size) to see how Density changes.
⚓ Will it Float or Sink?
**Rule:** If Density < 1.0 g/mL, it floats. If > 1.0 g/mL, it sinks. Select an object or create a custom one to test it in water.
Reference Desk
Key formulas and vocabulary you need to memorize.
📐 Formula Table
| Goal | Formula | Units |
|---|---|---|
| Density (D) | m / V | g/mL, g/cm³ |
| Mass (m) | D × V | g, kg |
| Volume (V) | m / D | mL, cm³ |
| Volume (Sphere) | 4/3 × π × r³ | cm³, m³ |
| Displacement | V_final - V_initial | mL |
Water Displacement
Method to find the volume of irregular objects by measuring water level rise.
Matter
Anything that has mass and takes up space (volume).
Karat
A unit of mass for gemstones. 1 karat = 0.2 g.
Cubic Centimeter
A unit of volume (cm³) exactly equal to 1 milliliter (mL).
Practice Arena
Test your understanding. Completion contributes to your score.
Complete the Sentences
📝 Self-Check Mode: Try to solve these problems on paper first. Enter your answer to compare, or toggle the solution to see the step-by-step work.