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# 5.3 Mass & Volume

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### 5.3 Mass & Volume

1. 1. 5.3
2. 2.  Mass: the amount of matter in an object  Measured using metric units (grams or kilograms)  You can use a pan balance to measure mass  Which block has more mass?  Mass and weight aren’t the same  Weight is the measure of gravity’s pull on you ▪ Your weight on the moon is 1/6 your weight on Earth ▪ How much would someone weigh on the moon if they weighed 120 pounds on Earth? ▪ It doesn’t matter if you are on the Earth or the moon, your mass stays the same
3. 3.  Volume: the amount of space taken up by an object  You can measure the volume of solids, liquids, and gases ▪ V = length × width × height ▪ V = 5 cm × 4 cm × 3 cm ▪ V = 20 × 3 ▪ V = 60 cm³
4. 4. 1. Fill a beaker or graduated cylinder with water and note the volume 2. Then, place the object in the beaker or graduated cylinder 3. Note the new reading and find the difference between the two volumes 23 – 20 = 3 cm³ 20 mL 23 mL volume of the rock
5. 5.  Liquids have a definite volume, but they take the shape of their containers  These two glasses of orange juice look different but they contain the same volume of juice!
6. 6. Gases spread out to fill their containers The volume of gas is the same as the size of its container
7. 7. Density: the measurement of how heavy something is for its size Density = Mass ÷ Volume  D = 180 g ÷ 60 cm³  D = 3 g/ cm³ Volume = 60 cm³ Mass = 180 g
8. 8.  Atoms: the smallest parts that make up matter  Protons: exist in the center, or nucleus, of an atom ▪ Have a positive charge ▪ The number of protons identifies the atom (atomic number)  Neutrons: exist in the center, or nucleus, of an atom ▪ Have no charge (neutral)  Electrons: move around the nucleus of an atom ▪ Have a negative charge  Everything is made up of atoms!