Density
Also known as: mass per unit volume
The mass of a substance per unit volume. Density is used to identify substances, predict floating/sinking, and separate mixtures.
💡 Intuition
Density answers 'how heavy is this for its size?' A small lead ball is heavier than a large foam ball — lead is denser.
Core Idea
Density is an intensive property — it doesn't change with amount. A drop of water and an ocean have the same density.
🔬 Example
🎯 Why It Matters
Density is used to identify substances, predict floating/sinking, and separate mixtures.
⚠️ Common Confusion
Density is not the same as weight. A large block of wood can weigh more than a small piece of iron, but iron is still denser.
How to Use Density
When this concept appears in chemistry, it usually controls how you interpret a representation, a quantity, or a change in a system. Students make faster progress when they can explain what density tells them before reaching for an equation or memorized phrase.
A strong self-check is to say what density does, what it does not do, and which nearby idea it is easiest to confuse with. That kind of explanation makes later calculations, lab reasoning, and compare pages much more reliable.
Related Concepts
Prerequisites
Next Steps
How Density Connects to Other Ideas
To understand density, you should first be comfortable with physical property. Once you have a solid grasp of density, you can move on to mixture separation.
Go Deeper
Frequently Asked Questions
What is Density in Chemistry?
The mass of a substance per unit volume. A measure of how tightly packed the particles are.
Why is Density important?
Density is used to identify substances, predict floating/sinking, and separate mixtures.
What do students usually get wrong about Density?
Density is not the same as weight. A large block of wood can weigh more than a small piece of iron, but iron is still denser.
What should I learn before Density?
Before studying Density, you should understand: physical property.