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# Measurement PowerPoint PPT Presentation

Measurement. The metric system…. Length. Distance or size in one dimension. In the US we use feet, inches and Miles The metric equivalent is Meters 1 M = 3.28 feet 1KM = .62 Miles The diameter of a CD or DVD is 12 cm. A doorknob is typically about 1 m high. Mass.

Measurement

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## Measurement

The metric system…

### Length

• Distance or size in one dimension.

• In the US we use feet, inches and Miles

• The metric equivalent is Meters

• 1 M = 3.28 feet

• 1KM = .62 Miles

• The diameter of a CD or DVD is 12 cm.

• A doorknob is typically about 1 m high.

### Mass

• Mass is a measure of matter. Often confused with weight.

• Weight = Mass X Gravity.

• On earth Mass = Weight

• If you go to the moon your mass does not change but you weight does, because gravity is different.

• 100 lbs = 45.4 Kg

1 ml of water weighs 1 gram. 1 liter of water weighs 1 kilogram, so 1 cubic meter — 1000 liters — of water weighs 1000 kilograms or 1 metric ton.

A US penny weighs exactly 2.5 g, while the nickel weighs exactly 5 g.

### Area

• Size in two dimensions

• 1 square inch is = 6.45 Square cm (cm2)

• An 8.5” X 11” page is 603 cm2

8.5 inches

11 inches

602 cm2

### Volume

• Measures size in 3 dimensions or how much space an object takes up.

• 1 ml = 1 cubic centimeter (cc)

• A graduated cylinder is used to measure volume.

• Always read at bottom of the meniscus

### Volume

• How do you measure the volume of an irregular object?

### Volume

• How do you measure the volume of an irregular object?

Displacement!

### Density

• How much matter is contained in a certain volume

• = mass / volume

• If 1 ml of water weighs 1 gram, what is the density of water?

### Density

• How much matter is contained in a certain volume

• = mass / volume

• If 1 ml of water weighs 1 gram, what is the density of water?

• 1 g/ml

• If something is more dense than water it sinks… if it is less dense than water…

### It Floats!

As you move up the ladder, move the decimal place to the left for each step up .

As you move down the ladder, move the decimal to the right for each step down.

### Quiz

• Triple beam balance is used to measure…

• A graduated cylinder is used to measure…

• What is the mass of a ml of water?

• What is the density of water?