The heating curve for a substance is shown below. The substance initially is a solid. It then becomes a liquid and a gas. Which of the line segments (I-V) represents the solid-to-liquid phase transition? 
Definitions:
Graph
A visual representation of data or mathematical functions using a coordinate system, often to illustrate relationships between variables.
Linear Inequalities
Mathematical statements involving linear expressions that utilize inequality symbols to compare the expressions.
Linear Inequalities
Mathematical statements involving linear expressions that use inequality signs to relate the expressions.
Graph
A visual representation of data, functions, or equations on a coordinate plane, illustrating relationships between variables.
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