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Measurement The metric system…

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**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.

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**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 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.

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**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

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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

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**Volume of regular objects can be calculated from a few measurements**

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

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**Volume How do you measure the volume of an irregular object?**

Displacement!

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**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?

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**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…

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It Floats!

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Metric ladder 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.

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**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?

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