A typical phase change diagram is shown below. What are the correct names of the numbered stages (legs) of the phase diagram?

I don't see anything representing a phase diagram.

A typical phase change diagram is shown below. What are the correct names of the numbered arrows?

To determine the correct names of the numbered stages or legs in a phase change diagram, you need to understand the different phases of matter and their transitions. The most common phase changes are solid to liquid (melting), liquid to gas (vaporization), and solid to gas (sublimation).

Here is how you can identify the correct names of the numbered stages on a phase change diagram:

1. Solid: The stage at the lowest temperature and pressure is usually representing the solid phase of the substance. It is usually labeled as "solid" or designated with the symbol "s."

2. Melting: The stage where the substance transitions from a solid to a liquid is called melting. It occurs at a specific temperature known as the melting point. This stage is labeled as "melting" or sometimes as "fusion."

3. Liquid: The region where the substance exists as a liquid is typically labeled "liquid" or designated with the symbol "l." The temperature and pressure values during this stage remain constant until the next phase change occurs.

4. Vaporization: The stage where the substance undergoes a phase change from a liquid to a gas is called vaporization. It might occur either at a specific temperature known as the boiling point (like boiling water) or at other temperatures (like evaporation). This stage is labeled as "vaporization" or "boiling."

5. Gas: The region representing the gaseous phase of the substance is usually labeled "gas" or designated with the symbol "g." The temperature and pressure values during this stage also remain constant until another phase change transpires.

Please note that these are the general names and labels you would expect to find on a typical phase change diagram. Depending on the specific diagram or the substance in question, there may be additional labels or different notations used.