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I. MEASUREMENTS

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A. ALL MEASUREMENTS MUST HAVE TWO PARTS

1. A NUMBER

– TELLS HOW MUCH IS BEING MEASURED

– TELLS WHAT IS BEING MEASURED

2. A UNIT

EX: 1

gram

50

seconds

time

mass

A. Base Units – a unit based on an object or

event in the physical world.

B. Derived units – unit defined from a

combination of several base units

ex: Density = mass / volume

units: g / L

Unit = meter (m)

Instrument = ruler, meter stick, measuring tape

A B

longer distance

shorter distance

C D

Unit = seconds (sec)

Instrument- watch, stopwatch

Unit = gram (g)

Instrument- balance

less mass

more mass

more mass

less mass

Unit = Liter (L) or

cubic centimeters (cm³) or (cc)

Instrument- graduated cylinder or ruler

Formula: V = l x w x h (cube, rectangular prism)

Unit = grams orgrams (g/L or g/cm³)

liter cm³

D = mass

volume

Instrument- balance and graduated cylinder

Unit = degrees Celsius (°C) ,

Fahrenheit (°F), Kelvin (K)

Instrument- thermometer

K = 273 -°C °F = °C(1.8)+32

°C = 273+K °C = °F-32

(1.8)

Unit = centimeters squared (cm²)

Instrument- ruler

A = l x w (square, rectangle)

A = pr2 (circle)

outside of outside shell

balloon of egg