MEASUREMENT

Measurement

Determination of amount of something

Number value and a unit

Unit –

standard amount that

everyone agrees with

ENGLISH SYSTEM

United StatesCommon measurements

Miles, yards, feet, inches, pounds, pints, quarts, gallons, cups, teaspoon

Only 2-3 Countries use this

(its an old system)

International System of Units

”SI”Metric system

created in 1800’s in FranceRelates all units to form a base of 10

1960 named SI

U.S. is the only industrialized nation

not to adopt the SI

“SI”base units

Length - meters

Mass - grams

Volume - liters

Temperature - Kelvin or Celsius

UNCERTAINTY

All physical measurements are to some extent uncertain.

The degree of percision is indicated by

SIGNIFICANT FIGURES

Metric Conversions Ladder Method

T. Trimpe 2008 http://sciencespot.net/

KILO1000Units

HECTO100

Units

DEKA10

UnitsDECI

0.1Unit

CENTI0.01Unit

MILLI0.001Unit

MetersLitersGrams

Ladder Method

How do you use the “ladder” method?

1st – Determine your starting point.

2nd – Count the “jumps” to your ending point.

3rd – Move the decimal the same number of jumps in the same direction.

4 km = _________ m

12

3

How many jumps does it take?

Starting Point Ending Point

4.1

__.2

__.3

__.= 4000 m

Conversion Practice

UNCERTAINTY

All physical measurements are to some extent uncertain.

The degree of precision is indicated by

SIGNIFICANT FIGURES

Write the correct abbreviation for each metric unit.

1) Kilogram _____ 4) Milliliter _____ 7) Kilometer _____

2) Meter _____ 5) Millimeter _____ 8) Centimeter _____

3) Gram _____ 6) Liter _____ 9) Milligram _____

Problems: 1)How many milliliters are in a liter?

2) How many centimeters are in a meter?  3) How many kilometers are in a meter?

4) How many centimeters are in a kilometer?

5) How many kilometers are in a centimeter?

Metric Conversion Challenge

Try these conversions, using the ladder method.

1) 1000 mg = _______ g 6) 1 L = _______ mL 11) 160 cm = _______ mm

2) 14 km = _______ m 7) 109 g = _______ kg 12) 250 m = _______ km

SI - length

Meters 1 kilometer (km) = 1,000 meters (103) 1 hectometer (hm) = 100 meters (102) 1 decameter (da) = 10 meters (101) 1 meter 10 decimeters (dm) = 1 meter (10-1) 100 centimeters (cm) = 1 meter (10-2) 1,000 millimeters (mm) = 1 meter (10-3)

SI - Mass

Grams 1 kilogram (kg) = 1,000 grams (103) 1 hectogram (hg) = 100 grams (102) 1 decagram (dag) = 10 grams (101) 1 gram 10 decigram (dg) = 1 gram (10-1) 100 centigram (cg) = 1 gram (10-2) 1,000 milligram (mg) = 1 gram (10-3)

(usually in kg)

SI - Volume

Liters 1 kiloLiter (kL) = 1,000 liters (103) 1 hectoLiter (hL) = 100 liters (102) 1 decaLiter (daL) = 10 liters (101) 1 Liter 10 deciLiter (dL) = 1 liters (10-1) 100 centiLiter (cL) = 1 liters (10-2) 1,000 milliLiter (mL) = 1 liters (10-3)

SI - Temperature

210 C = room temperatureCelsius (0C) = 1000 C boiling water

00 C freezing water

Dimensional Analysis

Given | needed| = | |

Ex. Convert 10 meters into kilometersEx. Convert 10 meters into kilometersa. 10 meters is givenb. Kilometers is neededc. 10 m | 1 km | = 10 km = 0.01 km

| 1,000 m | 1,000