| |
Information about Relative Humidity |
Relative humidity (r.h.) shows the relationship between absolute humidity
(the amount really there) and the saturation state of water vapors. Relative
air humidity is measured using humidity indicators, that show on their
displays from 0% (absolutely dry air) up to 100% (air that is completely
saturated, such as fog, clouds or steam bath). Some models of humidity
indicators are an unlimited measurement range. The physical area is between
40 and 65% r.h. Given that hot air possesses the ability to absorb more
water vapour than cold air, people feel that in winter, air is too dry and
in summer it is too humid. If air heats up it increases the amount of water
vapour to that of saturation. The consequence is that the % of relative
humidity decreases while the real quantity of water remains constant.
Something similar occurs when air is cooled, decreasing the quantity of
water vapour. This increases the percentage value of relative humidity.
Condensation forms when there is an excess of water in saturated conditions.
Some of our humidity indicators offer the ability to not only measure
relative humidity and temperature, but can also calculate dew point and dew
point temperature. Dew point temperature is defined as the temperature at
which the actual vapour content of air is the maximum (100% relative
humidity). Dew point temperature is independent of the actual temperature.
One possibility of dew point temperature is freezing metal until its surface
forms condensation. The temperature of the metal will then be the dew point
temperature. With this rain gauge you will be able to measure relative
humidity which will be shown on the display. |
Here you will find all
the measuring
instruments available at PCE Instruments.
|
Contact:
PCE Instruments UK Limited
Units 12/13 Southpoint Business Park
Ensign Way, Southampton
United Kingdom, SO31 4RF
Phone. +44 ( 0 ) 2380 98703 0
Fax +44 ( 0 ) 2380 98703 0 |
Comeback to
rain gauge |
Below you will find an overview of the different product groups of
measuring instruments |
|
|
|
|
|