Question

What's the most reliable indicator you should use when determining if you should modify activity for heat?

Answer 1

The indicator which is most dependable in order to determine modified heat activity or not is the heat index.

Further Explanation:

The heat index is the index that displays a temperature which is a combination of both relative humidity and the air temperature. It is also called apparent temperature, the temperature which is actually felt by the human body.

The process by which the human body attains cooling is perspiration. It is also known as sweating. The perception of heat results in sweating which is eliminated from the body by evaporation. When the body is unable to evaporate the sweat, it cannot control the internal temperature properly. The evaporation of the sweat from the body results in a reduction of the body temperature or in other words cools down the body. When the atmospheric humidity is high, the evaporation rate drops. As a result, less heat is removed and the body feels overheated. This implies that humid conditions make the body feel warmer whereas, as the humidity goes down perspiration increases and therefore, in arid conditions the body feels cooler.

This shows a direct link between the relative humidity and the air temperature with the heat index as the heat index goes up with the increase in humidity and air temperature. Different people perceive heat differently due to their different body shapes, the difference in hydration, or metabolic differences. Therefore, heat index measurement depends on person to person and how they feel during respective humidity and temperature conditions.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Environmental Science

Keywords:

Heat index, overheat, relative humidity, temperature, apparent temperature, perspiration, sweating, evaporation, arid conditions.

Answer 2

Heath index chart is the best indicator you should use when determining if you should modify activity for heat. The "heat index" is a single value that looks for both temperature and humidity. The higher the heat index, the weather will feel the hotter since sweat does not immediately evaporate and cool the skin. The heat index used is much better than air temperature alone for estimating the risk to workers from environmental heat sources.