First structure of key COVID enzyme at human body temperature

Scientists studying a COVID-19 coronavirus enzyme at temperatures ranging from frosty to human-body warm discovered subtle structural shifts that offer clues about how the enzyme works. The findings, published in IUCrJ, the ...

Factors in the severity of heat stroke in China

Heat waves are predicted to be more frequent, intense, and longer lasting as the climate warms. This year, for example, India, Europe, and the United States all have experienced record-breaking heat. Not only do heat-related ...

'Extreme healt belt' to cover middle of US by 2053: report

An area of intensely warm weather—a so-called "extreme heat belt"—with at least one day per year in which the heat index hits 125 Fahrenheit (52C), is expected to cover a US region home to more than 100 million people ...

Scientists reveal source of internal mildew in sunflower seeds

A research team led by Prof. Wu Yuejin from the Hefei Institutes of Physical Science (HFIPS) of the Chinese Academy of Sciences has revealed the source of internal mildew in sunflower seeds for the first time and proposed ...

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Humidity

Humidity is a term for the amount of water vapor in the air, and can refer to any one of several measurements of humidity. Formally, humid air is not "moist air" but a mixture of water vapor and other constituents of air, and humidity is defined in terms of the water content of this mixture, called the Absolute humidity. In everyday usage, it commonly refers to relative humidity, expressed as a percent in weather forecasts and on household humidistats; it is so called because it measures the current absolute humidity relative to the maximum. Specific humidity is a ratio of the water vapor content of the mixture to the total air content (on a mass basis). The water vapor content of the mixture can be measured either as mass per volume or as a partial pressure, depending on the usage.

In meteorology, humidity indicates the likelihood of precipitation, dew, or fog. High relative humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin. This effect is calculated in a heat index table, used during summer weather.

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