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Measurment

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Measurment

Science 8

Ms. Drake

Brookville Intermediate School

- 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!!

- 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.

- 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

- Length, Width, Height
- Tools: Ruler, Meter Stick, Tape Measurer
Unit: METER

- Tools: Ruler, Meter Stick, Tape Measurer

- 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)

- How much space matter
occupies

- Tools (liquid): Graduated Cylinder, Beaker, Flask
Unit: LITER

- Tools (liquid): Graduated Cylinder, Beaker, Flask

- Water in a graduate has a curved surface called the meniscus. You always read the graduated cylinder at eye level.

- Always check the unnumbered marks on a graduate to see how many sections there are and what they measure.

- We use a method called water displacementto 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

- The amount of matter an object has
- Tools: Balance, Scale
Unit: GRAM

- Tools: Balance, Scale
- Use a triple-beam balance to measure an object’s mass.

- How long it takes an event to happen
- Tools: Stop Watch or Clock
Unit: HOURS, MINUTES, SECONDS

- Tools: Stop Watch or Clock

- The measure of how hot or cold something is
- Tools: Thermometer
Unit: C

- Tools: Thermometer
- H20 freezes at 0 degrees Celsius and boils at 100 degrees Celsius.

- 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?

- Now which one is more dense?

- Density = mass OR mass ÷ volume.
volume

- Units for density: g .
cm3

ALWAYS REMEMBER UNITS!

- 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?

- 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?

- 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?

- 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 onthe top.

- 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?

- Which liquid has the highest density?
- Which liquid has the lowest density?
- Which liquid has the middle density?

- Imagine that the liquids on the right have the following densities:
- 15g/cm3 10g/cm3
- 3g/cm3 9g/cm3
- 7g/cm3 12g/cm3

- Match the colors to the correct densities