Which statement best describes the globe temperature component of WBGT?

• A. The globe temperature represents radiant heat exposure and energy from sources like the sun and equipment.
• B. The globe temperature is the same as the air temperature measured by a dry-bulb thermometer.
• C. The globe temperature reflects humidity alone.
• D. The globe temperature measures noise levels in the environment.

Answer: (A)

The globe temperature component captures radiant heat in the environment. The globe thermometer is a small, black-painted globe with a thermometer inside, designed to absorb infrared energy from surrounding sources. Its reading reflects the radiant heat load from the sun, hot equipment, and other surfaces, not just the air temperature. This radiant heat contribution is what the globe temperature represents within WBGT, complementing the wet-bulb (humidity and evaporative cooling) and dry-bulb (air temperature) measurements. So the best description is that it measures radiant heat exposure from sources like the sun and equipment. It isn’t simply the air temperature, it isn’t a measure of humidity alone, and it doesn’t assess noise.