## Why do I need to know about Graphs?

Graphs and tables are always important in science. You will see them from junior science all the way to university and in many different jobs. In fact, as I am sure you know, graphs and tables are everywhere in your life.

You should learn how to make and how to read and interpret all kinds of graphs. It helps scientists look at variations, patterns and trends with data. So, here is a basic way to look at graphs in the English language.

You should learn how to make and how to read and interpret all kinds of graphs. It helps scientists look at variations, patterns and trends with data. So, here is a basic way to look at graphs in the English language.

## TAble of data

First, look at the table.
The first column (on the left) is the . This is just a scientific name for the thing you are going to change, or is going to change anyway (e.g. time).independent variableThe next column/s will be the that change because of independent variable. An easier way to remember this is this is the thing you measure (e.g. temperature, colour change, dependent variable/sSo, remember to make you table in this pattern. |

When you have a large amount of data, it is much easier to understand any trends if it is made into a graph. So, it is important to be able to read and make a graph.

## Graph

First, where does the data go on the graph? What goes on the x-axis, and what goes on the y-axis? This is important for making a useful graph.
Basically, the independent variable (e.g. time) goes on the x-axis. This is the horizontal axis. The dependent variable (you measured, e.g. temperature) goes on the y-axis. This is the vertical axis. This is a just a basic overview, but it should help you organize more effectively. |

Data is not very useful unless you analyse it.

First, you should look at all of the recorded data and understand the trend (it goes up or down). Next, a good scientist will ask why the trend went up or down.

First, you should look at all of the recorded data and understand the trend (it goes up or down). Next, a good scientist will ask why the trend went up or down.

Always ask why. Why did it increase / decrease / change colour / get hotter etc.? Question everything. This will lead to new problems and a deeper understanding.

## Simplify English

As we saw in last lesson, some words in English look
to learn or understand. We now know this is impossibleNOT TRUE! You can understand the word if you break it down into smaller parts. Let’s look at these two words – and interpolate.extrapolate Interpolate = Inter + polate. Inter = between; polate = the points.Extrapolate = Extra + polate. Extra = outside; polate = the points. |

## REFOCUS..... What about MATTER?

Ok... here is a diagram of the changes in state of matter of water. It is sometimes called a "phase change diagram".

## What would it look like?

What would the water look like at the following points on the graph?

## Analyse

What do you think caused the sudden up and down results at the beginning of this graph? There is no exact answer.

## Extension

If you would like to challenge yourself to more graphing problems, then I recommend this website - http://ths.sps.lane.edu/chemweb/unit4/problems/phasedia/