*Scientific studies involve experiments and collection of data. Data are mere number and can not be used unless interpreted. Graphs are commonly used to interpret data.
*Graphs serve as visual aid to display clearly how two (or more) quantities are related each other in any experiments.
*Sometimes you have to accept uncertainties in experiments due to error in conducting experiments, these can be shown by graph drawing.
What should be found in a graph?
*The common used title is graph of (quantity) against (quantity)
*Basically, there are 2 axes (horizontal axis and vertical axis), it is a good practice to draw the 2 axes, 2 cm from the edge of the graph
Give label of the 2 axes as quantity / unit or quantity
unit
*Scale if necessary, it should be fives or tens.
What you should do
*Always begin from the origin (the point where you start your experiment) for example if you start your experiment at 400C then you have to begin at 400C, do not try to lengthen the line below 400C.
*One axis is for the independent variable, the other for the dependent variable.
*When you plot the graph, make the line or the curve pass through as many points as possible, and draw firmly, do not go over the line / curve again.
So what is gradient?
The value is the division of vertical side with the horizontal side (do not forget its unit).
Gradient will be the constant of the relation of the variables.
From the graph also, we can conclude that degree of X is degree of Fahrenheit, there are still many conclusion can we make by interpreting the graph.
Try below exercise :D
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