A cooling curve for some substance is shown below. Which of the line segments (I-V) represents cooling of the gas? 
Definitions:
Valid Scales
Tools or instruments that have been proven to accurately and consistently measure variables they are designed to assess.
Focus Groups
A research method in which a small, diverse group of people are gathered to discuss and give feedback on a particular subject, product, or policy.
Single System Designs
A research design tailored to evaluate the effectiveness of an intervention or treatment on a single subject or system over time.
AB Designs
A basic type of research design that compares two groups, A and B, to assess the effect of an intervention or treatment.
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