Chapter 2 Data in Science

Scientific Measurement The Metric System Based on 10 –Easy to convert units Universal –Can be used by scientists around the world –Easy to understand Most of the countries in the world use it

The Metric System METRIC MEASUREMENT DEFINITIONUNITSTOOL USED LengthThe distance between objects Meter (m)Meter stick, Metric ruler VolumeThe amount of space something it occupies Liter (L)Graduated cylinder MassThe amount of matter in an object Gram (g), kilogram (kg) Triple-beam balance TemperatureThe amount of heat energy an object contains degrees celcius ( O C), kelvins (K) Thermometer WeightA measure of gravitational force exerted on an object Newtons (N)Spring scale

Length –Basic Unit is the meter (m) –Tool used is a metric ruler or meter stick –Used to measure how long something is or distance between objects of places

1g=a dollar bill 1kg=a small puppy Mass –Basic unit is the gram (g) or kilogram (kg) –Tool used is the triple- beam balance –Used to measure how much material an object contains A balance measures mass (not weight) – mass does not change when gravity change on the moon your weight changes while your mass stays the same

Volume –Basic unit is the liter (L) –Tool is the graduated cylinder Count the lines Watch the meniscus –Used to measure how much space an object takes up

Metric Conversions Metric Ladder KilohectoDeka Basic unit decicentimilli X 1000X 100X 10X 1/10X 1/100X 1/1000 PREFIXES M E T E R L I T E R G R A M VALUES Giga (G) = X 1 billion Mega (M) = X 1 million micro (  ) = X 1 millionth nano (n) = X 1 billionth

Metric Conversions Metric Ladder kilohectoDeka Basic unit decicentimilli METER LITER GRAM mLg Mnemonic Device: King Henry Died By Drinking Chocolate Milk

Metric Conversions How it works… kilohectoDeka Basic unit decicentimilli METER LITER GRAM Move the decimal to the right… 5 kg = _____ dag

Metric Conversions How it works… kilohectoDeka Basic unit decicentimilli METER LITER GRAM Move the decimal to the right… 1.4 m = _____ mm

Metric Conversions How it works… kilohectoDeka Basic unit decicentimilli METER LITER GRAM Move the decimal to the left… 90 L = _____ hL

Metric Conversions How it works… kilohectoDeka Basic unit decicentimilli METER LITER GRAM Move the decimal to the left… 35.2 cL = _____ daL H

1) 54 km = __ m 54 km = m 2) 6.7 g = __ cg 6.7 g = 670. cg 3) 543 daL = __ dL 543 daL = dL kmhmdam meter dmcmmm kghgdag gram dgcgmg kLhLdaL liter dLcLmL 4) 54 cm = __ m 54 cm = 0.54m 5) 6.7 mg = __ dag 6.7 mg = dag 6) 543 L = __ kL 543 L = kL kmhmdam meter dmcmmm kghgdag gram dgcgmg kLhLdaL liter dLcLmL

Try these: 1) 12 dg= ______dag 2) 5.23m = _____ mm 3) 8 cL = _____ hL 4) 457 cm = _____ m 5) 5 kL = _____ daL 6) dg = _____ kg ,