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**What the Heck is Metrics?**

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**Metrics is the Language of Science**

By measuring, scientists can express their observations more precisely and communicate more information about what they observe.

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Metrics is worldwide The standard system of measurement used by scientists around the world is known as the International System of Units, which is abbreviated as SI Systeme International d’Unites in French

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**Metrics is actually easier than English Units**

Click here to access video clip on metrics SI units are easy to use because they are based on multiples of 10. Each unit is 10 times larger than the one before. Each unit is 10 times smaller than the next unit.

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**Some nifty prefixes Copy this chart into your notes Remember:**

Killer Hippos Die by Drinking Chocolate Milk Common SI Prefixes Prefix Symbol Meaning kilo k 1,000 hecto h 100 deka da 10 BASE deci d 0.1 (one tenth) centi c 0.01 (one hundreth) milli m 0.001 (one thousandth

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Measuring Length The meter (m) is used to measure length or distance between two points. The distance from the floor to a doorknob is about one meter. The distance from fingertips to nose is about 1 meter.

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**Measuring Length Long distances are measured in kilometers (km)**

The distance from Orion to Kirt’s Drive In is about 1 kilometer.

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Measuring Length Small lengths are measured in centimeters (cm) or millimeters (mm). The width of your finger is about one centimeter. The thickness of a dime is about one millimeter.

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**Measuring Length Length can be measured with things like:**

a meter-stick a ruler a micrometer a measuring tape

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**Measuring Length Try it out… Measure the width of your hand. DO IT!**

(record in your notebook) Measure the width of your hand. What is the width in centimeters? What is the width in millimeters? What is the diameter of a penny? DO IT!

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Measuring Mass To measure the amount of matter in an object, use the gram (g). One gram is approximately the mass of a paper clip.

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**Measuring Mass Large objects are measured in kilograms (kg).**

One liter of bottled water weighs about one kilogram. The average 7th grader measures about 45 kg.

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**Measuring Mass Small masses are measured in milligrams (mg).**

One Tylenol pill is usually about 100 milligrams.

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Measuring Mass Mass is usually measured with a balance, like a triple beam balance. Or a digital scale can be used.

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**DO IT! Measuring Mass Try it out… (record data in your notebook)**

What is the mass of a penny? What is the mass of a seashell? DO IT!

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**Measuring Liquid Volume**

The liter (L) is used to measure the amount of space that a liquid takes up. Liquid soda-pop often comes in 2-Liter bottles.

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**Measuring Liquid Volume**

Small volumes are measured in milliliters (ml). Vaccines are measured in milliliters.

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**Measuring Liquid Volume**

Scientists use graduated cylinders to measure liquid volume. (Graduated means it is marked with standard volume measurements) Beakers, flasks, pitchers, carafes, etc. may also be used.

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**Measuring Liquid Volume**

When using a graduated cylinder, the liquid often “sticks” to the sides of the cylinder. This forms a curved surface on the top of the liquid, known as a meniscus. Always measure at the bottom of the meniscus.

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**Measuring Temperature**

Scientists measure the temperature of a substance using the Celsius scale. Temperature is measured in degrees Celsius (oC).

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**Measuring Temperature**

Temperature is measured using a Celsius thermometer. Water freezes at 0oC and boils at 100oC.

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**Measuring Temperature**

You try it… (record data in your notebook) What is the temperature of this room? What is the temperature of the human body? DO IT!

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Measuring Time The unit scientists use to measure time is the second (s). This is the same as English units 60 seconds = 1 minute 60 minutes = 1 hour

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**Measuring Time DO IT! Try it out…**

Practice using the stopwatch – how long does it take to sing the alphabet song? DO IT!

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**(we had to move the decimal back 3 spaces to get back to 1.0)**

Scientific Notation When we measure things that are really big, or really small, we use scientific notation. One meter in scientific notation would be 1.0 x 100 m One kilometer in scientific notation would be 1.0 x 103m (we had to move the decimal back 3 spaces to get back to 1.0) You try it… Write the number 180,000,000,000 In scientific notation

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**Powers of 10 Click on the link above to take a fantastic voyage…**

Did you get 1.8 x ?

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