Ambient Weather WS-108 Uživatelský manuál stáhnout pdf (Strana 38)

Term

Definition

way as possible with a second device (instrument).

Dew Point

The dew point is the temperature at which a given parcel of humid air must be

cooled, at constant barometric pressure, for water vapor to condense into water. The

condensed water is called dew. The dew point is a saturation temperature.

The dew point is associated with relative humidity. A high relative humidity

indicates that the dew point is closer to the current air temperature. Relative

humidity of 100% indicates the dew point is equal to the current temperature and the

air is maximally saturated with water. When the dew point remains constant and

temperature increases, relative humidity will decrease.

Heat Index

The Heat Index, sometimes referred to as the apparent temperature, is a measure of

how hot it really feels when relative humidity is factored with the actual air

temperature.

To find the Heat Index temperature, look at the Heat Index chart below. As an

example, if the air temperature is 96°F and the relative humidity is 65%, the heat

index (how hot it feels) is 121°F.

IMPORTANT: Since heat index values were devised for shady, light wind

conditions, exposure to full sunshine can increase heat index values by up to 15°F.

Also, strong winds, particularly with very hot, dry air, can be extremely hazardous.

The Heat Index Chart shaded zone above 105°F shows a level that may cause

increasingly severe heat disorders with continued exposure or physical activity.

Heat Index is not calculated below 80°F.

HectoPascals

(hPa)

Pressure units in SI (international system) units of measurement. Same as millibars

(1 hPa = 1 mbar)

Hygrometer

A hygrometer is a device that measures relative humidity. Relative humidity is a

term used to describe the amount or percentage of water vapor that exists in air.

Inches of

Mercury

Pressure in Imperial units of measure.

1 inch of mercury = 33.86 millibars

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 44 45 46

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Ambient Weather WS-108 Uživatelský manuál Strana 38