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The ABC’s of Science. Intro to Life Science Measurement Metric System Part 1: Length Volume. Science is all around us. Botany: the study of plants, uses PS to explain how plants use carbon dioxide (CO 2 ) and water (H 2 O)to make food. Science is all around us.

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the abc s of science

The ABC’s of Science

Intro to Life Science

Measurement

Metric System Part 1:

Length

Volume

science is all around us
Science is all around us
  • Botany: the study of plants, uses PS to explain how plants use carbon dioxide (CO2) and water (H2O)to make food
science is all around us1
Science is all around us
  • Geology: explain earthquake waves and rock composition
  • Oceanography: chemistry of ocean water
  • Ecology: the nitrogen cycle and the transfer of energy between organisms in a food chain
  • Biology: how the heart pumps blood, how the eyes & ears work and how the brain sends electrical impulses throughout the body.
what are the abc s of science
What are the ABC’s of Science?
  • The Metric System
  • Safety Rules
  • The Scientific Method

--> We will be “reviewing” all of the above… pay attention, you will be tested on it!

mini contest
Mini-Contest
  • Which group can measure the length of the room the BEST?
  • In your group, plan (quietly and secretly) HOW you are going to measure the room. You have 3.5 minutes to plan
  • You may use any of the measuring tools on the counter.
  • Now, grab your tools and MEASURE (you have 4.5 minutes)
mini contest1
Mini-Contest
  • Write down our answer on a sticky note.
  • Let’s see who got the answer.
  • Answer: the room is _________ long.
  • Did everyone get the same answer?
  • Why not?
it all depends on the foot
It all depends on the foot!
  • Numbers and units are used to make measurements.
  • The distance from your desk to my desk could be 25 shoe lengths or 30 shoe lengths.
  • It depends on how big the shoe is.
  • Think of Shaq’s foot versus Mini-Me.
it all depends on the foot1
It all depends on the foot!
  • You can see that to use practical measurements, a measurement standard HAS to be used.
  • In other words, everyone has to use the SAME system or units.
  • Otherwise, it just gets confusing.

Wow, why didn\'t

I think of that!

let s talk metric
Let’s talk Metric
  • A standardis a fixed quantity used by everyone when measuring.
  • Here in America we use an English system: foot, yard, and mile.
  • However, MOST people use another system called the International System of Units or SI(which stands for Système Internationale d’Unités)
  • This is the modern form of the metric system.
measurement
Measurement
  • By using this system ALL scientists can understand each others measurements.
  • If I conducted an experiment here in America, even someone in Zimbabwe would be able to understand my measurements.
  • And, everything is done in multiples of 10, so changing from one unit to another is easier than with English units.
break it down
Break it down
  • OK, let’s get this as simple as we can.
  • We are going to look at all of our metric measurement units as two-part words.
  • The first part is the PREFIX.
  • The second part is the type of UNIT.
  • So --> PREFIX - UNIT
part 1 the prefix
Part 1: the PREFIX
  • Here are some important prefixes:
  • You need to memorize these
part 2 the unit
Part 2: the UNIT
  • Here are some important UNITs, and you need to memorize these too.
break it down yo self
Break it down yo’self!
  • One kilometer is equal to ____ meters.
    • kilo - meter
      • prefix = kilo or 1000
      • meter = unit measuring distance
  • Therefore: 1 kilometer = 1000 meters.
  • 5 kilometers would be:
    • 5 x 1000 meters = 5,000 meters
  • Always remember to break it down!
i still don t get it
I still don’t get it.
  • Here’s another way to go from one unit to another; just remember:
  • King Henry Died of Drinking Chocolate Milk Mmmmmm.
  • King Henry Died of Drinking Chocolate Milk Mmmm

i e e e e i i

l c k c n l c

o t a i t l r

o i i o

  • To convert to a larger unit, move the decimal place to the left (divide)
  • To convert to a smaller unit, move the decimal place to the right (multiply)
let s practice
Let’s Practice
  • 10 grams = _____ kilograms
    • Move the decimal three places to the left (divide)
    • .01kg
  • 56 meters = _____ centimeters
    • Move the decimal two places to the right (multiply)
    • 5,600 cm
  • 876 centimeters = ____ kilometers
    • Move the decimal five places to the left (divide)
    • .00876 km
let s talk length
Let’s talk Length
  • The meter (m) is the SI unit of length.
  • A meter is about the distance from a doorknob to the floor.
  • A driver golf club is also about a meter in length.
  • The meter is divided into 100 equal parts called centimeters (cm).
  • There are 100 centimeters in a meter:
    • 100cm = 1 m
measuring length1
Measuring Length
  • An even smaller unit is a millimeter (mm).
  • The prefix milli- means 1/1000, so…
    • 1000 mm = 1 m
    • 10 mm = 1 cm
  • Long distances are measured in kilometers (km)
  • Note: here is the US, we measure speed by miles per hour, or mph. In most other countries, they measure in kilometers per hour.
you try it
You try it!
  • Name 3 things that are about one meter long
  • Name 3 things that are measured in centimeters
  • Name 3 things that are small enough to be measured in millimeters
answers
Answers:

4. Meters: golf club, bath towels

5. Centimeters: your little fingernail, the distance between the lines on standard notebook paper, the width of a large paper clip

6. Millimeters: wire diameter, book thickness, tape width, camera film

let s talk volume
Let’s talk Volume
  • Have you ever heard someone say “this shampoo gives my hair a lot of volume!!!”
  • What does that mean?
  • Volume means to take up space.
  • Or, volume is the amount of space occupied by an object.
  • So if someone’s hair has a lot of volume, that means it is full.
  • It takes up a lot of space.
measuring volume of solid rectangular objects
Measuring Volume of Solid Rectangular Objects
  • For solid rectangular objects, the volume is the length x width x height.
  • V = l x w x h
  • A cubic meter (m3) is a unit of volume.
  • A cubic meter is a very large unit - it contains 1,000,000 cubic centimeters.
you try it1
You try it!

7. What is the volume of this solid?

  • V = l x w x h
  • V = 4cm x 1cm x 2cm
  • V = 8 cm3

8. What is the volume of this solid?

  • V = 3cm x 3cm x 3cm
  • V = 27 cm3
measuring volume of liquid objects
Measuring Volume of Liquid Objects
  • For liquid objects, we use graduated cylinders to measure the volume.
  • In cooking, we may also use measuring cups, teaspoons or tablespoons.
  • The level of a liquid in a graduated cylinder shows the volume of the liquid.
  • A liter (L) is a unit that is usually used to express volume
  • A soft drink bottle is a 2-liter bottle.
measuring volume1
Measuring Volume
  • For smaller volume measurements, we also use:
    • milliliter (ml)
    • cubic centimeter (cm3).
  • One liter contains 1000 milliliters or 1000 cubic centimeters.
  • 1L = 1000ml = 1000 cm3
  • 1mL = 1 cm3
accuracy is everything
Accuracy is Everything
  • To read the volume of the liquid, note the level at the bottom of the curve.
  • We call this the meniscus.
you try it2
You try it!

9. What is the volume in ml?

  • 73 ml

10. What is the volume in ml?

  • 21.5 ml
measuring volume of solid irregular objects
Measuring Volume of Solid Irregular Objects
  • So, how would I measure the volume of an irregular object such as a piece of clay?
  • I can’t measure the sides and I can’t use a measuring cup.
  • But I CAN still use a graduated cylinder.
  • Simply submerge the object in the graduated cylinder and record the difference in water level.
  • We call this measuring volume by displacement.
  • You will practice it during the lab today.
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