Date post: | 21-Jan-2016 |
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HUMIDITYBAD HAIR DAY
WHAT IS HUMIDITY?
•THE WATER VAPOR IN THE AIR (INVISIBLE)
WHAT IS SPECIFIC HUMIDITY?
•THE ACTUAL AMOUNT OF WATER VAPOR IN THE AIR.
•MEASURED IN GRAMS/METER3
CAPACITY!
•CAPACITY IS HOW MUCH WATER VAPOR THE AIR CAN HOLD.
•WARM AIR CAN HOLD MORE VAPOR THAN COLD AIR!
EXAMPLES OF CAPACITY
• STADIUM CROWD CAPACITY HOW FULL?
HHS 2000 ÷2600 =0.77 OR 77%
CC 2000 ÷3400 =0.59 OR 59%
RELATIVE HUMIDITY
•A COMPARISON BETWEEN THE SPECIFIC HUMIDITY (ACTUAL AMOUNT OF VAPOR IN THE AIR) AND THE CAPACITY (HOW MUCH WATER VAPOR THE AIR CAN HOLD).
•%
EXAMPLES
• AIR AT A CERTAIN TEMPERATURE CAN HOLD 22 G OF VAPOR PER M³, BUT IT ACTUALLY ONLY HAS 11 G/M³. WHAT IS THE…
SPECIFIC HUMIDITY? 11 G/M³
CAPACITY? 22 G/M³
RELATIVE HUMIDITY? 11 G/M³ ÷ 22 G/M³ = 50%
DEW POINT
• DEW POINT – THE TEMPERATURE AT WHICH 100% RELATIVE HUMIDITY IS REACHED (OR SATURATION).
TEMPERATURE AND HUMIDITY!• WARMER AIR CAN
HOLD MORE WATER!
• IF THERE IS THE SAME AMOUNT OF WATER VAPOR IN THE AIR THE WARMER AIR WILL HAVE A LOWER HUMIDITY, THE COLDER AIR A HIGHER HUMIDITY.