Measurement

You are making a measurement when you

Check you height

Read the time

Take your temperature

Check the speed of the car

What instruments would you use to do these?

Some Tools for Measurement

Measurement in Science

In science we

do experiments

measure quantities

use numbers to report measurements

Learning Check

What are some SI units that are used to measure each of the following?

A. length

B. volume

C. weight

D. temperature

Metric System (SI)

A decimal system based on 10 Used in most of the world Used by scientists and hospitals

Units in the Metric System

length metre m

volume litre L

mass gram g

temperature Celsius °C

time second s

Stating a Measurement

In every measurement there is a

Number

followed by a

Unit from the measuring device

Measurement Units used Symbol

Length millimetrecentimetremetrekilometre

mmcmmkm

little k = 1000

Measuring Length

Ruler: http://www.k12math.com/math-concepts/measurement/ruler-cm.jpg

How many millimeters are in 1 centimetre?

What is the length of the line in centimetres? _______cm

What is the length of the line in millimetres? _______mm

What is the length of the line to the nearest centimetre? ________cm

HINT: Round to the nearest centimetre – no decimals.

1 centimetre = 10 millimetres

Measurement Units used Symbol

Area square centimetre

square metre

cm2

m2

4cm x 4cm = 16 cm2

Measurement Units used Symbol

Volume millilitrelitrecubic centimetrecubic metre

mLLcm3

m3

Measurement Units used Symbol

Mass gram kilogram

gkg

Measurement Units used Symbol

Time second minute hour

sminhr

Measurement Units used Symbol

Speed metres per second

kilometres per hour

ms-1

kmh-1

Measurement Units used Symbol

Temperature degrees Celsius

oC

Measurement Units used Symbol

Measurement activity1.Length of a book2.Length of a bench3.Width of pencil case4.Temperature of tap water5.Hop on one foot6.Circumference of head7.Height of door frame