On a pressure-temperature chart, which axis typically represents temperature?

On a pressure-temperature chart, which axis typically represents temperature?

• A. Temperature
• B. Pressure
• C. Humidity
• D. Time

Answer: (A)

In a pressure–temperature diagram, the temperature is plotted along the horizontal axis while pressure is shown on the vertical axis. This setup follows the idea that temperature is the variable you vary to see how pressure responds, so you read the corresponding pressure by locating the temperature on the x-axis and tracing upward to the curve to read the value on the y-axis. This convention is standard in refrigerant PT charts and other PT relationships, making it quick to determine pressure for a given temperature. Humidity and time aren’t part of this type of chart, and pressure is not represented on the horizontal axis.

In a pressure–temperature diagram, the temperature is plotted along the horizontal axis while pressure is shown on the vertical axis. This setup follows the idea that temperature is the variable you vary to see how pressure responds, so you read the corresponding pressure by locating the temperature on the x-axis and tracing upward to the curve to read the value on the y-axis. This convention is standard in refrigerant PT charts and other PT relationships, making it quick to determine pressure for a given temperature. Humidity and time aren’t part of this type of chart, and pressure is not represented on the horizontal axis.