Stagnation temperature () is a thermodynamic property of a fluid flow representing the total temperature at a point where the fluid velocity is reduced to zero (stagnation point). It accounts for both static temperature and kinetic temperature present in the fluid flow. Stagnation temperature is the total temperature of a fluid at a stagnation point, where the fluid comes to rest due to an increase in static temperature and a decrease in kinetic energy. The SI unit of stagnation temperature () is the Kelvin (K) or Celsius (°C). Stagnation temperature can be calculated using,
Where,
- is the stagnation temperature,
- is the static temperature of the fluid,
- is the velocity of the fluid at the stagnation point,
- is the specific heat capacity at constant pressure of the fluid.