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.