Mass, Volume, &

Density

What makes the ice cubes float in your water?

Mass of an Object

Mass – Amount of matter in an object.

*Reminder* Matter is a substance that

takes up space.

Mass

Mass is measured in grams.

We will measure mass using a triple beam scale.

Mass is constant and doesn’t change like weight (gravity).

Triple Beam Scale

Make sure to start off

zeroing the scale.

To find mass: Go to

biggest way and work

your way down the scale

to smallest until it is

balanced.

Volume

This is a measurement of the amount of

space an object takes up or occupies.

We will measure volume in the units of

Millileters (mL) or cm^3.

Liquid Volume

To measure our

liquid we will use a

graduated cylinder.

*Tip* get on eye

level with the liquid

to take an exact

measurement.

Unit for liquid is mL

Solid Volume

The unit we will use here is cm^3

mL=cm^3

Usually measured by L x W x H

We will measure our ice in the graduated

cylinder.

Density

Density: 2 ways to view it

1. The mass of a substance per unit volume

2. How many particles there are in a area of space.

Units: g/cm^3 or g/mL

Density equation

Density is an objects ratio of its mass to

volume.

Mass:Volume

Density= Mass/Volume.

Density Triangle

How to use:

1. Cover up the term you are looking for.

2. Use the two other variables to find the

one you are looking for.

3a. If they are beside each other then

multiply.

3b. If one is on top of the other then divide it

by the bottom one.

Density Example

Mass of wool ball: 103 grams

Volume of wool ball: 2000mL

What is the density?

Density = 103g/2000 mL

Density = 0.05 g/mL

Density Example 2

A 275 g object occupies a volume of 250 mL.

What is the density?

How to change Density

We can either keep the mass the same and

change the volume

Or we can change the mass and keep the

same volume

Change the Mass

If we increase mass then we increase

density

If we decrease mass we decrease density

Look at example below: Left has less mass

and right has more mass.

Change the Volume

Increasing the volume will decrease the

density

Decreasing the volume will increase the

density.

Look at example below: Left has increased

volume and right has decreased volume.

Hmmm…

So What makes your ice float?