Density of Materials

What’s the formula for density?

Density = mass/volume

Density

A measure of how tightly the mass of an object is packed into the space it takes up.

What does it mean if a material is dense?

It’s particles are packed tightly together. A less dense object would have its particles spread out. This means that they can be compressed because they can move together and occupy the space there was (this doesn’t change the mass, but it changes the volume).

What is the arrengement of particles in a solid?

• Fixed pattern

• Regular arrengement

• Strong force of attraction

• Vibrate since they have little energy

• Highest density since they are packed together.

What is the arrengement of particles in a liquid?

• Irregular arrangement

• the particles can move, but are always touching each other

• Weaker force of attraction

• Move at different directions in low speeds

• More energy than solids

• Medium density

What is the arrengement of particles in a gas?

• Almost no force of attraction

• Free to move around

• More energy than solids and liquids

• Lowest density

• Move randomly in high speeds

EXAM QUESTION
Describe the methods that the student should use to calculate the densities of one regular and an irregular object.

Regular

1. Balance the object in a scale to find the mass

2. Use a ruler to find the object’s length, width, and height.

3. Use these measurements to find the volume(length x width x height)

4. Use the formula density = mass/volume

Irregular

1. Balance the object in a scale to find its mass

2. Submerge the object in an eureka can filled with water.

3. Transfer the water displaced to a measuring cylinder.

4. Record the volume of the water in the measuring cylinder. That is your volume

5. Use the formula density = mass/volume