**2D Graphs **
**How do graphs help you as a scientist?
**
One purpose of scientific investigation is to understand the relationship between two
variables. For example, the graph shown below is a sample taken from Science Workshop, a
program commonly used in high school physics labs. This graph shows the relationship
between two variables; time and temperature. The data was collected during an experiment
where a metal was being heated. The** independent variable (time) is represented on the x
axis** and the **dependent variable (temperature) is represented on the y axis.** The
slope of the graph (Dy / Dx) represents the change in temperature over a
given time period.
The three graphs below each represent the
relationship between two variables: the change in world population over time, the change
in the oil production over time, and the change in the growth of plants given different
amounts of water.
*Click on title or image below to get larger
image with an explanation.*
**World
Population**
**Figure 1 **
**Gas Production**
**Figure 2**
**Plant Growth**
**Figure 3 **
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