Enter the absolute temperature at the surface (K) and the absolute flow temperature (K) into the Temperature Ratio Calculator. The calculator will evaluate and display the Temperature Ratio.

## Temperature Ratio Formula

The following formula is used to calculate the Temperature Ratio.

TR = TS / TF
• Where TR is the Temperature Ratio
• TS is the absolute temperature at the surface (K)
• TF is the absolute flow temperature (K)

To calculate the temperature ratio, divide the absolute temperature at the surface by the absolute flow temperature.

## How to Calculate Temperature Ratio?

The following example problems outline how to calculate Temperature Ratio.

Example Problem #1:

1. First, determine the absolute temperature at the surface (K).
• The absolute temperature at the surface (K) is given as: 40.
2. Next, determine the absolute flow temperature (K).
• The absolute flow temperature (K) is provided as: 70.
3. Finally, calculate the Temperature Ratio using the equation above:

TR = TS / TF

The values given above are inserted into the equation below and the solution is calculated:

TR = 40 / 70 = .5714

Example Problem #2:

For this problem, the variables required are provided below:

absolute temperature at the surface (K) = 80

absolute flow temperature (K) = 90