Who invented the device to measure humidity?

The hygrometer, which measures humidity in the atmosphere, was invented by the French physicist Guillaume Amontons (1663-1705).

What is humidifier fever?

If you do not clean your humidifier according to the manufacturer's recommendations, bacteria and mold may begin to grow on it, which could make you sick. Also, distilled water, not tap water, should be used in a humidifier because dissolved minerals in tap water can cause a fine white powder to blow in your home that can also encourage germs to spread. Though a variety of illnesses, ranging from allergic reactions to the common cold, could develop as a result, if they stem from a poorly maintained humidifier they might all be classified as "humidifier fever."

What is the ideal relative humidity that is the most comfortable for people?

A humidity level between 30 and 60 percent is generally considered comfortable for human beings, while keeping humidity below 50 percent has the added benefit of keeping dust mites under control in homes. Lower humidities tend to lead to dry or cracked skin, itching, and even respiratory problems, and higher humidity causes perspiration to be less effective in controlling body temperature, which makes people feel hotter. In northern climates, where winter dries out the air, humidity can drop below five percent, which is comparable to the humidity levels of a desert.

What is dew?

Dew is water vapor that has condensed onto cool surfaces. Usually, this happens overnight as air temperatures cool, and then the dew evaporates as the day progresses.

What is the dew point?

The dew point is the temperature at which air is full of moisture and cannot store any more. When the relative humidity is 100 percent, the dew point is either the same as or lower than the air temperature. If a fine film of air contacts a surface and is chilled to below the dew point, then actual dew is formed. This is why dew often forms at night or early morning: as the temperature of the air falls, the amount of water vapor the air can hold also decreases. Excess water vapor then condenses as very small drops on whatever it touches. Fog and clouds develop when sizable volumes of air are cooled to temperatures below the dew point.

What's the difference between dew point, humidity, and relative humidity?

While humidity and dew point are both measures of the amount of water contained in the air, humidity is measured as a percentage of water/air while dew point is indicated by temperature. The dew point indicates the temperature at which the air would become 100 percent saturated. The bigger the difference between the dew point and the current temperature, the less humid the air is. It is therefore the same type of measurement as relative humidity, except that relative humidity is expressed as a percentage and dew point is expressed using temperatures.

What is the difference between absolute and specific humidity?

Absolute humidity—given in grams per cubic meter—is the amount of water vapor in a cubic meter of air; specific humidity is the amount of water vapor per gram of air.

Does dew fall?

While this is a common expression, dew does not actually fall, a point that was proven in a demonstration conducted by Scottish-American physicist William Charles Wells (1757-1817) in 1814. Wells showed that dew actually formed on surfaces as water vapor condensed.

Where is the most humid place on Earth?

In terms of highest dew point temperatures, the extreme is found along the coast of Ethiopia along the Red Sea. Here, the average afternoon dew point in the month of June is a staggering 84°F (28.9°C). Tropical rainforests the world over, of course, are known for extremely high humidity.

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