Measurement A way to describe objects and events with
numbers; quantitative description. Standards of measurement needed to be
universal; they need to be agreed upon by people all over the world.
Every measurement has a number and UNIT!!
Rounding Look at the digit to the right of the place
being rounded If digit is 0-4, digit being rounded stays the same If digit is 5 or more, digit begin rounded increases by 1
Look at the digit being rounded to. Then look at the digits to its right. If those digits are to the right of a decimal, they are removed. If they are to the left of a decimal change them to zeros.
International System- SI Metric system Easier to use than the standard English
system System represents multiples of 10; DO
NOT use fractions Some units include: meter, kilogram, liter,
and second
Linear System For Solid Regular Objects
Perimeter- distance around the object (meter) Area- length * width (meter squared) Volume- length* width* height (meter cubed) Circumference- distance around a circle (meter)
Using a Graduated Cylinder
Water in a graduate has a curved surface called the meniscus. You always read the graduated cylinder at eye level.
Hint: Always check the
unnumbered marks on a graduate to see how many sections there are and what they measure.
Volume of Irregular-Shape Objects We use a method called water
displacement to determine their volume. Displacement is the change in the height of water when a non-regular shape is added.
Put some water in a graduate. Record the volume of the water. This is your initial volume.
Carefully slide the object into the graduated cylinder and record the new volume level. This is your final volume.
Subtract the initial volume from the final volume and you have the volume of the object.
Initial Volume Final Volume
Mass The amount of matter an object has
Tools: Balance, Scale
Unit: GRAM
Use a triple-beam balance to measure an object’s mass.
Temperature The measure of how hot or cold something is
Tools: Thermometer
Unit: C
H20 freezes at 0 degrees Celsius and boils at 100 degrees Celsius.
Tools of the TradeMeasurement device Dimension of measurement
Beaker Volume
Stopwatch Time
Balance Mass
Graduated cylinder Volume
Meter stick Length, width, height
Thermometer Temperature
Density Density is a comparison of how much
matter there is in a certain amount of space.
People in a square: Which square is more dense?
What is Density? Density = mass OR mass ÷ volume.
volume
Units for density: g .
cm3
ALWAYS REMEMBER
UNITS!
Let’s try a denisty problem together. . .
Frank has a paper clip. It has a mass of 9 g and a volume of 3 cm3. What is its density?
Frank also has an eraser. It has a mass of 3 g, and a volume of 1cm3. What is its density?
Work on these problems with your table group. . .
Jack has a rock. The rock has a mass of 6 g and a volume of 3 cm3. What is the density of the rock?
Jill has a gel pen. The gel pen has a mass of 8 g and a volume of 2 cm3. What is the density of the rock?
Try these on your own. . . Al’Licia has a watch. It has a mass of 4 g
and a volume of 2 cm3. What is the density of the watch?
Mia has a wallet. It has a mass of 15 g and a volume of 5 cm3. What is the density of the wallet?
Liquid Layers If you pour together liquids that don’t mix
and have different densities, they will form liquid layers.
The liquid with the highest density will be on the bottom.
The liquid with the lowest density will be on the top.
Liquid Layers Which layer has the highest
density? Which layer has the lowest
density? Imagine that the liquids have
the following densities: 10g/cm3. 3g/cm3. 6g/cm3. 5g/cm3.
Which number would go with which layer?
Liquid Layers- Try with your neighbor
Which liquid has the highest density?
Which liquid has the lowest density?
Which liquid has the middle density?