When evaluating good graph what are the things you look for

Here are the things I look for (can you find them in my Boyle’s Law graph below?).

1. A title that describes the experiment.

2. Axes that are

   (a) Highlighted (drawn darker than the rest of the lines)

   (b) Scaled (in units of 1, 2, or 5 or multiples of 10 of these numbers) to fill the whole graph area

   (c) Labelled with the variable name and units. Dependent variable on vertical axis; independent variable on horizontal axis.

3. A graph area containing

   (a) Horizontal and vertical grid lines from the major axis divisions

   (b) Plotted points marked by a special symbol (often a circle)

   (c) A line of best fit that goes as close as possible to all the points without necessarily going through any of them

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error