Dense and Mass

๐Ÿง  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.

โš–๏ธ What is Density?

  • Density is how tightly packed the matter is in an object.
  • Formula: Density = Mass รท 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.

๐Ÿ’ก 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:

๐Ÿงฑ Mass Example:

  • A bag of rice weighs 1 kg. The mass is 1 kg.
  • A feather has a very small mass, usually in grams.

๐ŸŒŠ Density Example:

  1. Oil and Water:
  • When you pour oil into water, the oil floats.
  • This is because oil is less dense than water.
  1. Ice in Water:
  • Ice floats because it is less dense than liquid water.
  • Even though both are Hโ‚‚O, the molecules in ice are spread out, making it less dense.
  1. 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.

๐Ÿ” 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!

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