When the graph relating two variables is a straight line passing through the origin, the two variables are proportional.
Understand the Problem
The question is focused on understanding the main ideas about the relationship between the volume and pressure of gases, as described by physical laws such as Charles's law. It asks to fill in blanks to complete each statement accurately.
Answer
Directly proportional
The final answer is 'directly proportional'.
Answer for screen readers
The final answer is 'directly proportional'.
More Information
When two variables are directly proportional, their graph is a straight line passing through the origin, indicating a constant rate of change between them.
Tips
Common mistakes include confusing directly proportional with inversely proportional, which would not pass through the origin.
Sources
- Identifying proportional relationships from graphs - Khan Academy - khanacademy.org
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