Introduction to Metric System

The Metric Scale & System K H D S D C M Kilo Hecto Deca Deci Centi Milli (k) (h) (da) (d) (c)(m) grams meters liters BIGSMALL

EASY WAY TO REMEMBER King Henry Died Sunday Drinking Chocolate Milk

MASS The amount of matter that is packed into an object. Use grams to measure mass

GRAMS The Symbol g Measures non-liquids Commonly used in cooking & food labeling

What do we use to measure Grams? We will use a Triple Beam Balance

How to use a Triple Beam Balance 1. Zero the balance 2. Slide all of the riders back to zero 3. Check the pointer (pointing to zero) 4. If necessary, use the adjustment screw to get back to zero 5. Place the object on the pan and move the riders along the beams beginning with the largest mass first

How is mass different than weight? WEIGHT: Determined by the pull of gravity on an object Note: If you leave Earth… Your weight will change Your mass will remain constant

LENGTH The distance between two points Use meters to measure length

METER The Symbol m Measures the distance between two points Commonly used for lengths of races

What do we use to measure meters? We will use rulers

ROUNDING How long is this line? Round to the nearest centimeter. 3.0 cm

Nearest 10th of a centimeter A centimeter is divided into 10 sections on a ruler This value is 1.5 cm

How long is this line Measure to the nearest 10th of a centimeter 3.3 cm

VOLUME The amount of 3-D space an object occupies Use liters to measure volume

Liter The symbol L Measures liquids Commonly used for items that take up space in a container

What do we use to measure Liters? We will use graduated cylinders and beakers

How to use a graduated cylinder MENISCUS: A curve in the surface of a liquid ALWAYS read from the bottom of the meniscus

How to use a graduated cylinder 1. Place graduated cylinder on flat surface 2. Become eye level with the cylinder 3. Find the bottom of the meniscus 4. Record the Volume to the nearest 10th of a mL

Read the meniscus & record the volume

Volume of objects We learned how to find volume of liquids Sometimes we want to know how much space non-liquids take up How can we find the volume of non-liquid objects????

VOLUME of a REGULAR object A regular object has even sides We can easily use a ruler to measure

FORMULA Volume = length x width x height V = l x w x h Units = cm x cm x cm = cm3

Practice Regular Object #1 Find the volume Length = 10.0 cm Height = 4.0 cm Width = 3.0 cm Formula: Substitute: Answer:

VOLUME of an IRREGULAR object An irregular object has un-even sides We cannot easily use a ruler Use a graduated cylinder

THE PROCESS 1. Place water in graduated cylinder 2. Find Meniscus & record the volume (mL) 3. Add object to the water 4. Find the new volume & record (mL) 5. Subtract (END - START)

Practice Irregular Object #1 Find the volume

DENSITY How tightly the matter in an object is packed together

Measuring Density Formula: Density = Mass Volume

Sink or Float Density of water = 1.0 g/cm3 Above 1.0 = SINK Below 1.0 = FLOAT

Density of a Regular object Mass = 60.0 g Volume = cm3 Calculate Density: Sink or Float?

Density of an Irregular Object Mass = 15.0 g Volume = 5.0 mL Calculate Density: Sink or Float?