In this presentation you will have a complete information about the humidity and its types and the instruments to measure it

1. Presented By: YOUR MANE
Effects of Humidity
Intrunments for Humidity

2. Effects of Humidity:
Plants
Animals
Humans

3. Effects on Plants:
 Transpiration of water vapour through leaf
stomata depends on the gradient of moisture
between the leaf interior (which is saturated)
and the overlying air, as well as the availability
of moisture in the soil.
 The lower the atmospheric humidity, the
greater the transpiration rate.
 The transpiration rate is determined by a
balance between the amount of energy
available to convert water from the liquid to
vapour phase and the moisture gradient.
 Transpiration rates also depend on the

5. Effects on Animals:
 Atmospheric humidity affects the organisms
by modifying its water content.
 Some forms are hygroscopic and absorb
water from moist air.
 Different studies showed that specific
organisms gains or lose weight depending on
the humidity’s in a certain environment.

6. a factors.
Two important humidity factors are Evaporation and
Condensation.

7. Effects on Humans:
 Humans too are very sensitive to humidity because our skin
relies on the air to get rid of moisture.
 So if the air is at 100% relative humidity, sweat will not
evaporate into the air. As a result, we feel much hotter than the
actual temperature when the relative humidity is high. If the
relative humidity is low, we can feel much cooler than the actual
temperature because our sweat evaporates easily, cooling us off.
 For example,
 if the air temperature is 75 degrees Fahrenheit (24 degrees
Celsius) and the relative humidity is zero percent, the air
temperature feels like 69 degrees Fahrenheit (21 C) to our
bodies.
 If the air temperature is 75 degrees Fahrenheit (24 C) and the
relative humidity is 100 percent, we feel like it's 80 degrees (27
C) out.
 People tend to feel most comfortable at a relative humidity of

9. Instruments to measure
Humidity level

10. Sling Psychrometer:
 often used to determine relative humidity
 . Consists of thermometers (wet bulb and dry
bulb).
 The difference between the dry and wet bulb
reading will give with the aid of psychometric
table, the dew point temperature and the relative
humidity.
 Performed near saturation but undera read at
lower humidities..

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12. Hygrothermograph:
 Records both
relative humidity and
temperature on
graph paper in the
same manner as the
thermograph and
barograph do.
 Art galleries and
research labs mostly
use
Hygrothermograph
to measure humidity
level in their

13. Hair Hygrometer:
 It works on the fact
that hair changes its
length when humidity
varies.
 This device usually
consists of a number of
human or horse hairs
connected to the
mechanical lever
system.
 When humidity
increases the length of
the hair becomes
longer.
 This device is less
accurate than the

14. Satellites:
 On a global scale, humidity is being
measured using remotely placed satellites.
 These satellites are able to detect the
concentration of water in the troposphere at
altitudes between 4 and 12 kilometers.
 Satellites that can measure water vapour
have sensors that are sensitive to infrared
radiation.

15. NASA Radar
RBA Radar
Space Radar