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Measurment. Science 8 Ms. Drake Brookville Intermediate School. 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.

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Measurment

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## Measurment

Science 8

Ms. Drake

Brookville Intermediate School

### 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

• Length, Width, Height

• Tools: Ruler, Meter Stick, Tape Measurer

Unit: METER

### 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)

### Volume

• How much space matter

occupies

Unit: LITER

• 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 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

### Mass

• The amount of matter an object has

• Tools: Balance, Scale

Unit: GRAM

• Use a triple-beam balance to measure an object’s mass.

### Time

• How long it takes an event to happen

• Tools: Stop Watch or Clock

Unit: HOURS, MINUTES, SECONDS

### 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.

### 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?

• Now which one 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 onthe 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?

### Liquid Layers- Now try on your own!

• 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