Step 1: Understanding the Concept:
A tephigram is one of four thermodynamic diagrams used in meteorology to analyze the vertical structure of the atmosphere.
Step 2: Detailed Explanation:
The name "Tephigram" is derived from its axes: \( T \) (Temperature) and \( \phi \) (Entropy).
In a tephigram:
1. Temperature (\( T \)) is plotted on one axis (usually tilted or rotated for clarity).
2. Potential temperature ($\theta$), which is directly related to entropy ($\phi$), is plotted on the other axis. Since \( d\phi = c_p \cdot d(\ln \theta) \), the axes effectively represent Temperature and Entropy.
This diagram is equal-area, meaning work done or energy changes (like CAPE) can be measured by areas on the plot.
Step 3: Final Answer:
The axes of a tephigram represent Temperature and Entropy.