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Omni Formula:
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The National Weather Service Wet Bulb Calculator Omni estimates wet bulb temperature from dry bulb temperature and relative humidity using the Omni formula. It provides an accurate assessment of heat stress and humidity effects on human comfort and safety.
The calculator uses the Omni formula:
Where:
Explanation: The equation accounts for the complex relationship between temperature and humidity to calculate the wet bulb temperature, which represents the lowest temperature that can be achieved through evaporative cooling.
Details: Wet bulb temperature is crucial for assessing heat stress, determining thermal comfort, predicting weather patterns, and evaluating the risk of heat-related illnesses in various environmental conditions.
Tips: Enter dry bulb temperature in °C and relative humidity as a percentage (0-100%). Both values must be valid numbers within their respective ranges.
Q1: What is wet bulb temperature?
A: Wet bulb temperature is the lowest temperature that can be reached by evaporating water into the air, representing the cooling effect of evaporation.
Q2: Why is wet bulb temperature important?
A: It's critical for assessing heat stress on the human body, as it combines temperature and humidity effects that determine how effectively the body can cool itself through sweating.
Q3: What are dangerous wet bulb temperature levels?
A: Wet bulb temperatures above 35°C are considered extremely dangerous as they exceed the human body's ability to cool itself, potentially leading to heat stroke.
Q4: How does this differ from heat index?
A: While both measure perceived temperature, wet bulb temperature is a physical measurement of evaporative cooling potential, while heat index is a calculated value that estimates how hot it feels to the human body.
Q5: What are typical applications of wet bulb temperature?
A: Used in meteorology, HVAC design, industrial processes, sports medicine, and occupational safety to assess thermal comfort and heat stress risks.