1 The Metric System

2 Easier to use because it is based on powers of 10. A metric unit has two parts: A prefix and a base unit Example cm, mL, mg The prefix tells you how many times to divide or multiply by 10

3 Some Base Units Length - meter(m) - more than a yard Mass - grams(g) - about a raisin Volume - Liter(L) - half of a two liter bottle

4 Some Prefixes kilo k 1000 times Hecto h 100 times Deka dk 10 times deci d 1/10 centi c 1/100 milli m 1/1000 Micro µ 1/ Nano n 1/

5 How much larger or smaller? Since metrics are based on the power of 10 each “step” is either: 10 times larger or 10 times smaller

6 Mass Not the same as weight, weight is mass multiplied with the force of gravity Measured with scales (Digital or triple beam) 1 g = 1 paper clip 1 mg = 10 grains of salt or 2 drops of water.

7 Length Measured with rulers centimeter - less than half an inch millimeter - the width of a paper clip wire

8 Volume For objects with a regular shape ( like a textbook or box), the volume is calculated by multiplying L x W x H –Units are cm 3 or m 3 Irregularly shaped objects measured by taking the difference in volume with a graduated cylinder Fluid ( liquids and gases) volume is measured using a graduated cylinder –Units are usually mL –The volume of 20 drops of water is approximately one milliliter

9 Measuring Temperature Celsius scale Water freezes at 0ºC Water boils at 100ºC Body temperature 37ºC Room temperature ºC 0ºC

10 Measuring Temperature Kelvin starts at absolute zero (-273 º C) degrees are the same size C = K -273 K = C Kelvin is always bigger. Kelvin can never be negative. 273 K

11 Questions? I will not sleep through my education. I will not sleep… --Bart Simpson