What the Heck is Metrics?

Transcription

1 What the Heck is Metrics? In your notebook, begin with a title for these notes. Then write down AT LEAST the things in red.

2 Metrics is the Language of Science By measuring, scientists can communicate more precisely.

3 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

4 Metrics is actually easier than English Units 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.

5 Some nifty prefixes Copy this chart into your notes Remember: Killer Hippos Die by Drinking Chocolate Milk or King Henry Drank my Delicious 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 (one thousandth)

6 The meter (m) is used to measure length or the 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. Measuring Length

7 Long distances are measured in kilometers (km) Measuring Length The distance from North Ogden Junior High to the city library is about 1 kilometer.

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

9 Measuring Length Length can be measured with things like: a meter-stick a ruler a micrometer a measuring tape

10 Try it out (record in your notebook draw pictures and write measurements with units) Measuring Length Measure the width of your hand. What is the width in centimeters? What is the width in millimeters? DO IT DRAW IT! What is the diameter of a penny?

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

12 Large objects are measured in kilograms (kg). Measuring Mass One liter of bottled water weighs about one kilogram. The average 7 th grader measures about 45 kg.

13 Small masses are measured in milligrams (mg). Measuring Mass One Tylenol pill is usually about 100 milligrams.

14 Mass is usually measured with a triple beam balance. Measuring Mass A digital scale can be also be used.

15 Measuring Mass

16 Measuring Mass

17 Measuring Mass

18 Measuring Mass Try it out (record data and drawings in your notebook) What is the mass of Mrs. Nelson s stapler? What is the mass of a toy car? DO IT! What is the mass of your shoe?

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

20 Measuring Liquid Volume Small volumes are measured in milliliters (ml). Vaccines are measured in milliliters.

21 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.

22 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.

23 Measuring Liquid Volume Always measure at the bottom of the meniscus.

24 Copy the chart below into your notes:

25 King Henry drank my delicious chocolate milk. Kilo (k) Hecto (h) Deka (da) Meter (m), Liter (L), Gram (g) Deci (d) Centi (c) Milli (m)

26 Let s practice: 189 g = kg 476 hm = cm 36 dl = dal

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

28 Measuring Temperature Temperature is measured using a Celsius thermometer. Water freezes at 0 C and boils at 100 C.

29 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?

30 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

31 Measuring Time Try it out Practice using the stopwatch how long does it take to sing the alphabet song? DO IT! Record your answer in your notebook. Write in a complete sentence.

32 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 10 0 m One kilometer in scientific notation would be 1.0 x 10 3 m (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

33 Scientific Notation Did you get 1.8 x 10 11?