Drawing a line graph

A 2-D diagram of the apparatus used in the scientific investigation

open air hole

Closed air

hole

closed air hole

Line graphs show the relationship between experimental data.

Time

(minutes)

Temperature (oC)yellow blue

0 23 231 27 272 34 373 41 464 47 555 53 626 57 70

Use a ruler, pencil and rubber

Rule the axis to occupy as much of the graph paper as

possible

Label the axes including the units of measurement

Put the dependent variable on the ‘vertical axis’

and the independent variable on the ‘horizontal axis’

Independent variable – which variable will be changed?

Dependent variable - which variable will have to be measured or observed in order to get some data or information from the investigation?

Yellow or blue flame

The rate of heating up water measured in temperature (0C)

vertical range 0-70 oC horizontal range 0-6 minutes

Time (minutes)

Time (minutes)

Put the scale on the axis by counting the spaces and dividing by the range to get each division.

THE SPACES BETWEEN EACH TICK MARK MUST BE EQUAL

70 oC = 14 spaces10 oC = 2 spaces

“go up the vertical axis in multiples of 10 (0,10,20….70)”

60

30

40

20

10

0

50

70

Time (minutes)

THE SPACES BETWEEN EACH TICK MARK MUST BE EQUAL

6 minutes = 12 spaces 1 minute = 2 space “go across the horizontal axis in multiples of 1 (0,1,…6)”

60

40

20

1 0

2 6 3 4 5

Time (minutes)

plot the first point (0,23)

60

40

20

0 2 6 4

Time = 0

Go up the vertical axis until you reach 23 and put a cross at this point. (0,23)

Time (minutes)

plot the second point (0,27)

60

40

20

0 2 6 4

Time = 1

Go up the vertical axis until you reach 27 and put a cross at this point. (1,27)

Time (minutes)

plot the second point (0,27)

60

40

20

0 2 6 4

Time = 2

Go up the vertical axis until you reach 37 and put a cross at this point. (2,37)

Time (minutes)

plot the rest of the points

60

40

20

0 2 6 4

3 46

4 55

5 62

6 70

Time (minutes)

join the points with the line of best fit

60

40

20

0 2 6 4