Why is it important that scientists have the same units of measurement? What do you think would happen if scientists did not use the same measurements all over the world? Give 3 “real world examples” where you have seen SI units (m, g, L). Questions of the Day

The Metric System, Dimensional Analysis, and Significant Figures

Objectives Use Select and apply Make Use a variety of notations appropriately (e.g. exponential, functional, square root). Use Select and apply an appropriate method (e.g., mental mathematics, paper and pencil, or technology) for computing with real numbers, and evaluate the reasonableness of results. Select and apply Make decisions about units, scales, and measurement tools that are appropriate for problem situations involving measurement. Make Use concepts of length, area, and volume to estimate and solve real-world problems. Objectives

Kelvin – K (temperature) Basic Units combine with prefixes to make a final amount Metric System Basic SI Units Meter – m (length) Gram – g (mass) Liter – L (volume) Kelvin – K (temperature) Common Prefixes Micro – u 1/1000000 Milli – m 1/1000 Centi – c 1/100 Kilo – k 1000

SI Units 1 kg = kilo (1000) gram = 1000 grams 1 mm = milli (1/1000) meter = 1/1000 of a meter 1 uL = micro (1/1000000) liter = 1/1000000 of a liter 1 gram = 1/1000 kilogram = .0001 kg 1 meter = 1000 millimeters = 1000 mm 1 liter = 1000000 microliters = 1000000 uL

SI Units

Quick Check! Convert each to the unit in parentheses 257 g (kg) 22 mm (cm) 354 dL (L) 5 L (mL) 13 kg (cg) King Henry Doesn’t Usually Drink Chocolate Milk k – h – da – UNIT – d – c – m

SI Derived Units

Questions of the Day Convert 52.7 g to dg Convert 733 mm to km Give 3 examples of derived units. Write out the conversion ladder. (KHDUDCM) Questions of the Day

Objectives Use Select and apply Make Use a variety of notations appropriately (e.g. exponential, functional, square root). Use Select and apply an appropriate method (e.g., mental mathematics, paper and pencil, or technology) for computing with real numbers, and evaluate the reasonableness of results. Select and apply Make decisions about units, scales, and measurement tools that are appropriate for problem situations involving measurement. Make Use concepts of length, area, and volume to estimate and solve real-world problems. Objectives

Dimensional Analysis (Important for BIG conversions)

King Henry Doesn’t Usually Drink Chocolate Milk k – h – da – UNIT – d – c – m

Dimensional Analysis (Important for BIG conversions) Converting 10 m/s to km/hr

Significant Figures