What is the difference between dew point temperature and air temperature?

1. Different concepts

1. Dew point temperature: When the water vapor content in the air remains unchanged and the air pressure is kept constant, the temperature when the air is cooled to saturation is called the dew point temperature < /p>

2. Air temperature: The physical quantity that indicates the degree of hotness and coldness of the air is called air temperature, or air temperature for short.

2. Different observation methods

1. Dew point temperature: It is composed of optical sensor head, amplifier, power supply and other parts. Let the air continuously pass through a smooth mirror surface, and use artificial cooling to reduce the temperature of the mirror surface (for example, using the Peltier effect or a stream of cooling liquid flowing under it), so that water vapor in the air condenses on the mirror surface.

2. Air temperature: It is measured on a thermometer in a blind box 1.5 meters above the ground in the observation field. Since the thermometer maintains good ventilation and avoids direct sunlight, Therefore, it has better representativeness.

3. Different applications

1. Dew point temperature: It will be used to calculate the possibility of engine icing and fog. Therefore, dew point is an important issue for pilots. data.

2. Air temperature: Temperature records can characterize the thermal conditions of a place and are indispensable both in theoretical research and in applications in national defense and economic construction. Temperature is one of the conventional elements to be measured in surface meteorological observations.

Baidu Encyclopedia-Temperature

Baidu Encyclopedia-Dew Point