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AQA Science: Glossary - Continuous Variables
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A continuous variable is one which can have any numerical value. When you present the result of an investigation like this you should use a line graph.
For example: If you investigate the effect on the resistance of changing the length of a wire, the length of a wire you are using is a continuous variable since it could have any length you choose.
e.g. Carol is interested in the force between magnets. She fixes one to a top-pan balance and clamps another directly above it. By varying their separation, she can investigate the force of repulsion. The separation can have any value at all, so we call it a continuous variable. Line graphs enable you to show this type of variable very well.
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