🧠 What is Mass?
- Mass is the amount of matter in an object.
- It tells us how heavy something is (though mass and weight are not exactly the same).
- Measured in grams (g) or kilograms (kg).
Example:
- A brick has more mass than a sponge of the same size because it has more matter packed into it.
⚖️ What is Density?
- Density is how tightly packed the matter is in an object.
- Formula: Density = Mass ÷ Volume.
- High density means a lot of mass in a small space.
Example:
- A metal ball and a plastic ball of the same size:
- The metal ball feels heavier because it’s more dense.
💡 In the Atom’s Nucleus:
- The nucleus is dense because it has protons and neutrons tightly packed together.
- Although the nucleus is very small, it contains almost all the mass of the atom.
Let’s look at some real-world examples of mass and density:
🧱 Mass Example:
- A bag of rice weighs 1 kg. The mass is 1 kg.
- A feather has a very small mass, usually in grams.
🌊 Density Example:
- Oil and Water:
- When you pour oil into water, the oil floats.
- This is because oil is less dense than water.
- Ice in Water:
- Ice floats because it is less dense than liquid water.
- Even though both are H₂O, the molecules in ice are spread out, making it less dense.
- Boat on Water:
- A steel ship is heavy, but it floats because its shape makes its overall density lower than water.
- If you made the same steel into a solid ball, it would sink due to higher density.
🔍 Everyday Objects:
- A rock is more dense than a sponge of the same size.
- A brick feels heavier than a styrofoam block because the brick is more dense.
Would you like to connect this with how density and mass play a role in electricity? Let’s Go!
Explore the basics to become more knowledgeable. Let’s Go!