Dry-bulb temperature

Humidity and hygrometry
Specific concepts
Absolute / Specific / Relative Dew point (depression) Psychrometrics
General concepts
Air Concentration Density Dew Evaporation Humidity buffering (Atm.) Pressure Liquid water Avogadro's law Nucleation Thermodynamic equilibrium
Measures and Instruments
Heat index Sat. vap. density Mixing ratio Water activity H. indicator card Hygrometer Dry/Wet-bulb temperature

The dry-bulb temperature (DBT) is the temperature of air measured by a thermometer freely exposed to the air but shielded from radiation and moisture. DBT is the temperature that is usually thought of as air temperature, and it is the true thermodynamic temperature. It indicates the amount of heat in the air and is directly proportional to the mean kinetic energy of the air molecules. Temperature is usually measured in degrees Celsius (°C), Kelvin (K), or Fahrenheit (°F).

Unlike wet bulb temperature, dry bulb temperature does not indicate the amount of moisture in the air. In construction, it is an important consideration when designing a building for a certain climate. Niall called it one of "the most important climate variables for human comfort and building energy efficiency."^[1]

DBT is an important variable in Psychrometrics, being the horizontal axis of a Psychrometric chart.

See also

• Psychrometric chart
• Wet-bulb temperature
• Hygrometer
• Atmospheric thermodynamics

References

1. Nall, D. H. (2004-11). Looking across the water: Climate-adaptive buildings in the United States & Europe. In The Construction Specifier, 57, 50 – 56.