1. Mass
Mass: the measurement of How Much matter is in an object Units = grams (kg  mg)

2. Weight is defined as the force of gravity on an object
Weight is defined as the force of gravity on an object. Your weight can change if the force of gravity changes.
Ex: lbs on Earth = 16.5 lbs on the moon
(6x less gravity on the moon)
Ex: kg on Earth = 100 kg on the moon
(mass is not affected by gravity)

3. Density
Density is the measure of how much mass is contained in a given volume
Density = mass
volume

4. D=m/v (mass divided by volume)
1. grams/cubic centimeter g/cm3 (units solids)
2. grams/milliliter g/mL (units liquids)
Remember the methods are different for finding the volumes of Regular Objects, Irregular Objects, and Liquids

5. An object will FLOAT if it is LESS dense than the liquid
The density of an object does not change as its size changes.
Example: The density of pure gold is 19.3 g/cm3 no matter the size of the piece of pure gold
Once you know an object’s density you can then determine whether or not it will float in a given liquid.
Example:
An object will FLOAT if it is LESS dense than the liquid
An object will SINK if it is MORE dense than the liquid

6. Water has a known density of 1.0g/cm3 or 1.0g/mL
remember: 1cm3 = 1mL , so these two densities are EQUAL
Let’s Practice:
Mass 50g Volume 10mL Density = ______
Mass 20g Volume 40cm Density = ______